G-128: fleet renamed to PUNKSHELL via punkres; punkres 0.3.0 -drop-opaque-overlay for mingw stub symbol tables; punkshell 0.30.3

Forced fleet rebake (user-directed): all ten win32 kits now carry the embedded
PUNKSHELL group icon via punkres, verified per kit (punkres list, sidecar
icon_group=PUNKSHELL + embedding=punkres, extract-ico byte-identical spot
check) and booting (incl. metakit punksys 8.6.13 / punk86 8.6.17 and
punk902z 9.0.2). punkmagic excluded (runtime absent - keeps its old icon and
_build cache); punkshell902 linux = not applicable.

The first fleet pass surfaced a real shape: mingw-built runtimes (tclsh902z,
tclkit-win64-dyn family) keep COFF symbol/debug tables AFTER their sections,
the extraction head carries them, and punkres correctly refused those stubs
as data-classified overlay. Measured against twapi-era artifacts: Windows'
EndUpdateResource has always silently STRIPPED exactly those bytes at
stub-stamp time (leaving PointerToSymbolTable dangling) and the kits work -
so punkres 0.3.0 (upstream dca8634, re-vendored, 33/33) encodes the
distinction: -drop-opaque-overlay DISCARDS expendable trailing data and
zeroes the orphaned symbol-table header fields, vs -allow-opaque-overlay
which RELOCATES a real self-locating payload; conflicting flags rejected;
drop is inert on zip overlays. The seam's punkres arm passes -drop
(twapi-arm-equivalent stub hygiene; bin/AGENTS.md documents it).

Recovery note: a 10-minute foreground timeout killed the first 3-kit rerun
during deploy - stale src/_build/.punkcheck.lock removed after a dead-pid
check per the recorded procedure; the completion bake deployed the
already-wrapped kits. Full punkexe suite 83 tests 0 failed; goals_lint +
architecture_lint clean.

Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com

CHANGELOG.md

@@ -5,6 +5,21 @@ The latest `## [X.Y.Z]` header must match the `version` field in `punkproject.to
 Entries are newest-first; one bullet per notable change. See the root `AGENTS.md`
 "Project Versioning" section for the bump policy.
 
+## [0.30.3] - 2026-07-29
+
+- Fleet renamed: every win32 kit now carries the embedded `PUNKSHELL` group
+  icon via punkres (punksys, punk86, punk91, punkbi, punkluck86, punk902z,
+  punk905, punk91ix86, punk9_beta, punk9bi_beta; punkmagic excluded - its
+  runtime is absent; punkshell902 is a linux target, not applicable).
+- punkres 0.3.0: new `set-icon -drop-opaque-overlay` consent DISCARDS non-zip
+  trailing stub bytes (the COFF symbol/debug tables mingw-built runtimes
+  carry, which ride into extraction heads and previously made punkres refuse
+  those stubs), zeroing the orphaned symbol-table header pointer; distinct
+  from `-allow-opaque-overlay` which RELOCATES a real self-locating payload.
+  The bake's punkres arm passes the drop flag - matching the twapi arm's
+  measured long-standing EndUpdateResource stripping - so mingw-lineage stubs
+  (tclsh902z, tclkit-win64-dyn family) stamp identically to MSVC/zig ones.
+
 ## [0.30.2] - 2026-07-29
 
 - Baked kits' embedded RT_GROUP_ICON is now NAMED from the icon file's

bin/AGENTS.md

@@ -171,9 +171,15 @@ is selected when present; otherwise the twapi arm serves windows hosts with
 nothing built. The embedded RT_GROUP_ICON is NAMED from the icon file's
 uppercased rootname (`punkshell.ico` -> `PUNKSHELL`, RC convention; applies
 to per-kit overrides identically since they are also named `punkshell.ico`),
-with the resource language adopted from the group being replaced. Named
-"resources", not "icon", so the parked RT_VERSION stamping extends the same
-file.
+with the resource language adopted from the group being replaced. Stub
+hygiene: non-zip trailing bytes on a stub (the COFF symbol/debug tables
+mingw-built runtimes carry after their sections, which ride into the
+extraction head) are DROPPED at stamp time - the punkres arm via its
+`-drop-opaque-overlay` consent (which also zeroes the orphaned
+symbol-table header pointer), the twapi arm implicitly via
+`EndUpdateResource`'s long-standing stripping - so both arms emit the same
+payload-free stamped stub. Named "resources", not "icon", so the parked
+RT_VERSION stamping extends the same file.
 
 - Icon choice: a root-level `punkshell.ico` in the kit's own custom `.vfs`
   folder (consulted pre-merge, so the `_vfscommon.vfs` copy never reads as an

goals/G-128-portable-pe-resource-stamping.md

@@ -166,6 +166,26 @@ the parked RT_VERSION stamping wants, since the project version is known late.
   start and moves by exactly the shift delta. punkres handles this (verify
   invariant base2 == base1 + delta) and reports the leading-byte distance via
   an overlay_note line.
+- COFF symbol-table finding (2026-07-29, fleet rebake): mingw-built runtimes
+  (tclsh902z, the tclkit-win64-dyn* family) keep their COFF symbol/debug
+  tables AFTER the sections (located by the COFF header's
+  PointerToSymbolTable, outside every section - .file/crtbegin.c strings),
+  and the extraction head carries them, so the "payload-free" stub handed to
+  the icon seam has a data-classified overlay (306KB on tclsh902z, ~272KB on
+  the tclkits). punkres correctly REFUSED those stubs where MSVC/zig-built
+  stubs (symbols stripped to PDB / none) stamped clean. Measured against the
+  twapi-era artifacts: EndUpdateResource has ALWAYS silently stripped exactly
+  those bytes at stub-stamp time - the working twapi-era punk902z has zip
+  base == overlay start with the 306KB gone, the twapi-era punksys has the
+  metakit starting immediately at PE end, and both left PointerToSymbolTable
+  DANGLING (2294272 with the table gone) - so the bytes are proven
+  expendable for assembled kits. punkres 0.3.0 encodes the distinction as
+  two consent verbs: -allow-opaque-overlay RELOCATES (self-locating payloads
+  like metakit), -drop-opaque-overlay DISCARDS (expendable trailing data),
+  zeroing the symbol-table header fields it orphans rather than leaving them
+  dangling; the seam's punkres arm passes -drop (stub context: trailing
+  non-zip bytes are detritus by contract, matching the twapi arm's proven
+  de-facto behaviour), and the flags conflict if combined.
 - Recorded 2026-07-29 (user decision, increment-1 review): the acceptance's
   'kit' (sdx/metakit) shape clause is SATISFIED FOR NOW by the measured
   consent path (-allow-opaque-overlay; moved payload boots - see Progress and
@@ -301,3 +321,19 @@ the parked RT_VERSION stamping wants, since the project version is known late.
   (codepage divergence as per the Notes finding); sidecar icon_group +
   embedding recorded; final deployed state punkres-stamped and booting.
   punkshell 0.30.2.
+- 2026-07-29 increment 1c (user-directed fleet rebake): ALL ten win32 kits now
+  wear RT_GROUP_ICON "PUNKSHELL" lang 1033 embedded via punkres, verified by
+  punkres list on every deployed kit, sidecars icon_group=PUNKSHELL +
+  embedding=punkres, extract-ico byte-identical to punkshell.ico (spot
+  punk902z), and boots: punk91-family/punkluck86/punk91ix86 (earlier
+  increments) + punksys 8.6.13, punk86 8.6.17, punk902z 9.0.2 (this one).
+  punkshell902 (linux) NOT APPLICABLE as designed; punkmagic EXCLUDED (its
+  tclsh90magic runtime is absent - it keeps its old icon and its _build cache
+  until the runtime returns). The first fleet pass surfaced the COFF
+  symbol-table refusals on the three mingw-lineage stubs (see Notes) - fixed
+  properly via punkres 0.3.0 -drop-opaque-overlay (upstream dca8634,
+  re-vendored, suite 33/33) with the seam passing the flag; second pass
+  stamped all three (a foreground timeout killed the first 3-kit rerun during
+  deploy - stale .punkcheck.lock removed per the recorded recovery procedure,
+  completion bake deployed the already-wrapped kits). Full punkexe suite 83
+  tests 0 failed. punkshell 0.30.3.

punkproject.toml

@@ -1,4 +1,4 @@
 [project]
 name = "punkshell"
-version = "0.30.2"
+version = "0.30.3"
 license = "BSD-2-Clause"

src/make.tcl

@@ -6562,6 +6562,15 @@ proc ::punkboot::kit_icon_embed_punkres {punkres_exe exepath icopath {group_over
     if {$group_override ne ""} {
         lappend cmd -group $group_override
     }
+    #-drop-opaque-overlay: the stub contract is a payload-free prefix, so any
+    #non-zip trailing bytes are build detritus - concretely the COFF
+    #symbol/debug tables mingw-built runtimes carry after their sections,
+    #which ride into the extraction head. The twapi arm's EndUpdateResource
+    #has always silently stripped exactly those bytes (measured 2026-07-29,
+    #G-128 detail); punkres drops them deliberately and zeroes the dangling
+    #symbol-table header pointer. A REAL zip payload on a stub is unaffected
+    #(the flag is inert for zip-classified overlays, which punkres preserves).
+    lappend cmd -drop-opaque-overlay
     lappend cmd [file nativename $exepath] [file nativename $icopath] 2>@1
     if {[catch $cmd output]} {
         error "punkres set-icon failed: $output"

src/tools/punkres/PROVENANCE.md

@@ -8,8 +8,8 @@
   the punkshell repo root. That is a layout convention, not a requirement - if
   no checkout is present there, clone the remote to that location; the Vendored
   state commit below identifies the exact upstream state in any clone.
-- Vendored state: commit `c0eb919adf4bd542ff7b9827e49b4b7d791c51b6` (punkres
-  v0.2.0, 2026-07-29; upstream working tree clean at copy time)
+- Vendored state: commit `dca8634f190d8e9e800637211d666951737909da` (punkres
+  v0.3.0, 2026-07-29; upstream working tree clean at copy time)
 - Vendored: 2026-07-29 for goal G-128 (see
   `goals/G-128-portable-pe-resource-stamping.md`)
 - Lineage: first-party punkshell tool, written 2026-07-29 for G-128 - no

src/tools/punkres/README.md

@@ -26,7 +26,15 @@ Windows.
     file-relative convention.
   - zip64 / multi-disk: always refused.
   - non-zip overlay bytes: refused by default (their offset semantics are
-    unknowable); `-allow-opaque-overlay` moves them verbatim.
+    unknowable). Two distinct consents: `-allow-opaque-overlay` RELOCATES
+    them verbatim (a self-locating payload such as a metakit vfs survives);
+    `-drop-opaque-overlay` DISCARDS them - correct only for expendable
+    trailing data such as the COFF symbol/debug tables mingw-built runtimes
+    carry after their sections (a real payload would be destroyed). A drop
+    that removes the region the COFF `PointerToSymbolTable` points into also
+    zeroes that pointer and `NumberOfSymbols` instead of leaving them
+    dangling (which is what Windows' own `EndUpdateResource` leaves behind
+    when it strips trailing data).
 - Every `set-icon` run re-parses the file it just built and verifies the
   resources and the overlay before reporting success (read-back is built in).
 - Deterministic: stamping the same input twice yields byte-identical output.
@@ -38,7 +46,7 @@ Windows.
     punkres extract-ico [-group <id|name>] <pefile> <out.ico>
     punkres set-icon [-o <outfile>] [-group <id|name>]
                      [-allow-file-relative-shift] [-allow-opaque-overlay]
-                     [-strip-signature] <pefile> <icon.ico>
+                     [-drop-opaque-overlay] [-strip-signature] <pefile> <icon.ico>
     punkres version
 
 `set-icon` follows the semantics of punkshell's twapi arm exactly: ALL existing

src/tools/punkres/build.zig.zon

@@ -1,6 +1,6 @@
 .{
     .name = .punkres,
-    .version = "0.2.0",
+    .version = "0.3.0",
     .fingerprint = 0x663d2953305aee5d,
     .minimum_zig_version = "0.16.0",
     .paths = .{""},

src/tools/punkres/src/punkres.zig

@@ -10,7 +10,13 @@
 //are moved verbatim; file-relative ones are REFUSED by default and stamped
 //only with -allow-file-relative-shift (offsets rewritten by the shift delta,
 //convention preserved); zip64/multi-disk are refused always; non-zip overlay
-//bytes need -allow-opaque-overlay.
+//bytes need explicit consent - -allow-opaque-overlay RELOCATES them verbatim
+//(a real payload, e.g. metakit, survives if it self-locates), while
+//-drop-opaque-overlay DISCARDS them (correct only for expendable trailing
+//data such as the COFF symbol/debug tables mingw-built runtimes carry after
+//their sections; a real payload would be destroyed). When a drop removes the
+//region the COFF PointerToSymbolTable points into, that pointer and
+//NumberOfSymbols are zeroed rather than left dangling.
 //
 //Exit codes: 0 ok, 1 error, 2 hard refusal (zip64/multi-disk/odd signature),
 //3 refusal that a consent flag can lift (stated in the message).
@@ -34,10 +40,10 @@ var g_io: Io = undefined;
 //stdout with honestly-probed flags - set at entry (see stdout_file)
 var g_stdout: Io.File = undefined;
 
-pub const VERSION = "0.2.0";
+pub const VERSION = "0.3.0";
 
 pub const HEADER =
-    \\# PUNKRES 0.2.0 -- portable PE resource stamper (punkshell G-128)
+    \\# PUNKRES 0.3.0 -- portable PE resource stamper (punkshell G-128)
     \\
 ;
 
@@ -117,7 +123,7 @@ fn print_usage(exe: []const u8) !void {
         \\  {s} extract-ico [-group <id|name>] <pefile> <out.ico>
         \\  {s} set-icon [-o <outfile>] [-group <id|name>]
         \\          [-allow-file-relative-shift] [-allow-opaque-overlay]
-        \\          [-strip-signature] <pefile> <icon.ico>
+        \\          [-drop-opaque-overlay] [-strip-signature] <pefile> <icon.ico>
         \\  {s} version
         \\
         \\  set-icon replaces ALL RT_ICON/RT_GROUP_ICON resources with the images
@@ -125,8 +131,12 @@ fn print_usage(exe: []const u8) !void {
         \\  language; name 1 / lang 1033 when none). -group overrides the group
         \\  NAME (stored as given; lookups are case-insensitive) - language and
         \\  codepage adoption are unchanged. Every other resource type and any
-        \\  appended payload are preserved. Without -o the file is updated in
-        \\  place. Exit 3 = refused, a consent flag applies.
+        \\  appended payload are preserved. Non-zip trailing bytes:
+        \\  -allow-opaque-overlay RELOCATES them (a self-locating payload such
+        \\  as metakit survives); -drop-opaque-overlay DISCARDS them (only for
+        \\  expendable data such as COFF symbol tables - a real payload would
+        \\  be destroyed). Without -o the file is updated in place.
+        \\  Exit 3 = refused, a consent flag applies.
         \\
     , .{ tail, tail, tail, tail, tail });
 }
@@ -540,10 +550,15 @@ const SetIconFlags = struct {
     group_arg: ?[]const u8 = null,
     allow_file_relative_shift: bool = false,
     allow_opaque_overlay: bool = false,
+    drop_opaque_overlay: bool = false,
     strip_signature: bool = false,
 };
 
 fn cmd_set_icon(pe_path: []const u8, ico_path: []const u8, flags: SetIconFlags) !u8 {
+    if (flags.allow_opaque_overlay and flags.drop_opaque_overlay) {
+        errprintf("choose ONE of -allow-opaque-overlay (relocate) or -drop-opaque-overlay (discard) - they are opposite treatments of the same bytes.\n", .{});
+        return 1;
+    }
     var data = try read_file(pe_path);
     const pe = pemod.Pe.parse(allocator, data) catch |err| {
         errprintf("{s}: not a usable PE image: {}\n", .{ pe_path, err });
@@ -575,16 +590,21 @@ fn cmd_set_icon(pe_path: []const u8, ico_path: []const u8, flags: SetIconFlags)
     }
 
     //overlay classification and consent gates
-    const rep = try classifyOverlay(data, pe.overlay_offset, file_end);
+    var rep = try classifyOverlay(data, pe.overlay_offset, file_end);
+    var dropped_bytes: usize = 0;
     switch (rep.kind) {
         .zip_refused => {
             errprintf("REFUSED: appended zip payload is {s} - punkres does not process zip64/multi-disk archives (no consent flag lifts this).\n", .{rep.refused_reason});
             return 2;
         },
         .data => {
-            if (!flags.allow_opaque_overlay) {
+            if (flags.drop_opaque_overlay) {
+                dropped_bytes = rep.size;
+                file_end = pe.overlay_offset;
+                rep = .{ .kind = .none, .size = 0 };
+            } else if (!flags.allow_opaque_overlay) {
                 errprintf("REFUSED: {d} bytes of non-zip overlay follow the PE image. punkres cannot know whether their internal offsets survive being moved.\n", .{rep.size});
-                errprintf("Remedy: if the payload is safe to relocate verbatim (or offset-free), re-run with -allow-opaque-overlay.\n", .{});
+                errprintf("Remedy: -allow-opaque-overlay RELOCATES them verbatim (a self-locating payload such as metakit survives); -drop-opaque-overlay DISCARDS them (only for expendable trailing data such as COFF symbol/debug tables - a real payload would be destroyed).\n", .{});
                 return 3;
             }
         },
@@ -684,7 +704,23 @@ fn cmd_set_icon(pe_path: []const u8, ico_path: []const u8, flags: SetIconFlags)
             try printf("overlay: {d} opaque bytes moved verbatim by {d} (consented)\n", .{ overlay_len, delta });
         }
     } else {
-        try print("overlay: none\n");
+        if (dropped_bytes > 0) {
+            try printf("overlay: {d} bytes of non-zip trailing data dropped (consented) - nothing appended\n", .{dropped_bytes});
+        } else {
+            try print("overlay: none\n");
+        }
+    }
+    //a drop that removed the region the COFF symbol table lives in must not
+    //leave the header pointing past EOF (twapi's EndUpdateResource leaves it
+    //dangling; punkres zeroes it honestly)
+    if (dropped_bytes > 0) {
+        const psym = mem.readInt(u32, final[pe.coff_offset + 8 ..][0..4], .little);
+        const nsym = mem.readInt(u32, final[pe.coff_offset + 12 ..][0..4], .little);
+        if (psym != 0 and psym >= pe.overlay_offset) {
+            mem.writeInt(u32, final[pe.coff_offset + 8 ..][0..4], 0, .little);
+            mem.writeInt(u32, final[pe.coff_offset + 12 ..][0..4], 0, .little);
+            try printf("coff_symbols: symbol table ({d} entries) was in the dropped region - header pointer zeroed\n", .{nsym});
+        }
     }
     if (stripped_signature) {
         //zero the security directory in the OUTPUT (table bytes were dropped)
@@ -853,6 +889,9 @@ pub fn main(init: std.process.Init) !u8 {
             } else if (mem.eql(u8, argv[i], "-allow-opaque-overlay")) {
                 flags.allow_opaque_overlay = true;
                 i += 1;
+            } else if (mem.eql(u8, argv[i], "-drop-opaque-overlay")) {
+                flags.drop_opaque_overlay = true;
+                i += 1;
             } else if (mem.eql(u8, argv[i], "-strip-signature")) {
                 flags.strip_signature = true;
                 i += 1;

src/tools/punkres/src/punkres_test.zig

@@ -187,7 +187,7 @@ test "print usage" {
         \\  punkres.exe extract-ico [-group <id|name>] <pefile> <out.ico>
         \\  punkres.exe set-icon [-o <outfile>] [-group <id|name>]
         \\          [-allow-file-relative-shift] [-allow-opaque-overlay]
-        \\          [-strip-signature] <pefile> <icon.ico>
+        \\          [-drop-opaque-overlay] [-strip-signature] <pefile> <icon.ico>
         \\  punkres.exe version
         \\
         \\  set-icon replaces ALL RT_ICON/RT_GROUP_ICON resources with the images
@@ -195,8 +195,12 @@ test "print usage" {
         \\  language; name 1 / lang 1033 when none). -group overrides the group
         \\  NAME (stored as given; lookups are case-insensitive) - language and
         \\  codepage adoption are unchanged. Every other resource type and any
-        \\  appended payload are preserved. Without -o the file is updated in
-        \\  place. Exit 3 = refused, a consent flag applies.
+        \\  appended payload are preserved. Non-zip trailing bytes:
+        \\  -allow-opaque-overlay RELOCATES them (a self-locating payload such
+        \\  as metakit survives); -drop-opaque-overlay DISCARDS them (only for
+        \\  expendable data such as COFF symbol tables - a real payload would
+        \\  be destroyed). Without -o the file is updated in place.
+        \\  Exit 3 = refused, a consent flag applies.
         \\
     ;
     try expectExecute(&args, 1, output, tmp);
@@ -206,7 +210,7 @@ test "version" {
     var tmp = initTestDir();
     defer tmp.cleanup();
     const args = [_][]const u8{"version"};
-    try expectExecute(&args, 0, "punkres 0.2.0\n", tmp);
+    try expectExecute(&args, 0, "punkres 0.3.0\n", tmp);
 }
 
 test "set-icon -group renames the group; later stamps adopt it (convergent)" {
@@ -472,6 +476,76 @@ test "opaque non-zip overlay: refused by default, moved verbatim with consent" {
     try expect(mem.eql(u8, out[out.len - blob.len ..], blob));
 }
 
+test "drop-opaque-overlay discards expendable trailing data and zeroes the dangling symbol pointer" {
+    //the shape mingw-built runtimes hand the stub-stamping seam: PE image
+    //followed by its COFF symbol/debug tables (located by the COFF header
+    //pointer, outside every section). -drop discards them; the output must be
+    //byte-identical to stamping the same image with no trailing data at all
+    var arena = std.heap.ArenaAllocator.init(std.testing.allocator);
+    defer arena.deinit();
+    const alloc = arena.allocator();
+    var tmp = initTestDir();
+    defer tmp.cleanup();
+
+    const img = try synthpe.buildPe(.{ .alloc = alloc });
+    try writeTmp(tmp, "clean.exe", img);
+    const junk = "FAKE-COFF-SYMBOL-TABLE-DATA .file g-crtbegin.c ...............";
+    const dirty = try alloc.alloc(u8, img.len + junk.len);
+    @memcpy(dirty[0..img.len], img);
+    @memcpy(dirty[img.len..], junk);
+    //point the COFF symbol-table header fields at the trailing region
+    //(e_lfanew 0x80 -> COFF header at 0x84 -> PointerToSymbolTable at +8)
+    std.mem.writeInt(u32, dirty[0x8c..][0..4], @intCast(img.len), .little);
+    std.mem.writeInt(u32, dirty[0x90..][0..4], 12332, .little);
+    //keep the stored checksum honest after the header patch (parse tolerates
+    //any checksum; equality with the clean stamp is what matters below)
+    try writeTmp(tmp, "dirty.exe", dirty);
+    const test_ico = try synthpe.buildTestIco(alloc, 2);
+    try writeTmp(tmp, "test.ico", test_ico);
+
+    //refusal without a flag names BOTH remedies
+    const refuse_args = [_][]const u8{ "set-icon", "-o", "dout.exe", "dirty.exe", "test.ico" };
+    try expectExecuteContains(&refuse_args, 3, &[_][]const u8{}, &[_][]const u8{
+        "-allow-opaque-overlay RELOCATES",
+        "-drop-opaque-overlay DISCARDS",
+    }, tmp);
+
+    //conflicting consent flags are rejected
+    const conflict_args = [_][]const u8{ "set-icon", "-o", "dout.exe", "-allow-opaque-overlay", "-drop-opaque-overlay", "dirty.exe", "test.ico" };
+    try expectExecuteContains(&conflict_args, 1, &[_][]const u8{}, &[_][]const u8{
+        "choose ONE",
+    }, tmp);
+
+    //drop: stamps, reports the drop and the symbol-pointer zeroing
+    const drop_args = [_][]const u8{ "set-icon", "-o", "dout.exe", "-drop-opaque-overlay", "dirty.exe", "test.ico" };
+    try expectExecuteContains(&drop_args, 0, &[_][]const u8{
+        "bytes of non-zip trailing data dropped (consented)",
+        "coff_symbols: symbol table (12332 entries) was in the dropped region - header pointer zeroed",
+        "verify: resources re-read OK; no overlay",
+    }, &[_][]const u8{}, tmp);
+
+    //byte-identical to stamping the trailing-free image
+    const clean_args = [_][]const u8{ "set-icon", "-o", "cout.exe", "clean.exe", "test.ico" };
+    try expectExecuteContains(&clean_args, 0, &[_][]const u8{}, &[_][]const u8{}, tmp);
+    const dout = try readTmp(alloc, tmp, "dout.exe");
+    const cout = try readTmp(alloc, tmp, "cout.exe");
+    try expect(mem.eql(u8, dout, cout));
+
+    //-drop alongside a ZIP overlay is inert: the payload is preserved
+    const entries = [_]synthpe.ZipEntry{.{ .name = "p.txt", .data = "payload" }};
+    const zip_bytes = try synthpe.buildStoredZip(alloc, &entries, .archive, 0, "");
+    const zkit = try alloc.alloc(u8, img.len + zip_bytes.len);
+    @memcpy(zkit[0..img.len], img);
+    @memcpy(zkit[img.len..], zip_bytes);
+    try writeTmp(tmp, "zkit.exe", zkit);
+    const zdrop_args = [_][]const u8{ "set-icon", "-o", "zout.exe", "-drop-opaque-overlay", "zkit.exe", "test.ico" };
+    try expectExecuteContains(&zdrop_args, 0, &[_][]const u8{
+        "bytes preserved verbatim",
+    }, &[_][]const u8{}, tmp);
+    const zout = try readTmp(alloc, tmp, "zout.exe");
+    try expect(mem.eql(u8, zout[zout.len - zip_bytes.len ..], zip_bytes));
+}
+
 test "archive-relative zip preceded by other overlay bytes (nested-payload shape) stamps and verifies" {
     //the punkshell tclsfe stub carries its own zip payload; concatenating a
     //further zip (the zipcat shape built from a raw stub) yields an overlay