diff --git a/tools/mkdist.py b/tools/mkdist.py
index 6417092..8c91ded 100644
--- a/tools/mkdist.py
+++ b/tools/mkdist.py
@@ -100,8 +100,13 @@ def main():
     # d3dx9 + MSVC runtimes -- carried in redist/, shipped next to the exe;
     # the first zips included them and machines without the redists fail
     # to load the exe otherwise).
+    # ...but SKIP any that was already taken from beside the exe: both land at
+    # build/Release/<name> in the archive, so shipping both wrote a duplicate
+    # zip entry (d3dx9_43.dll, ~2 MB wasted, and some extractors warn).
+    beside_exe = {os.path.basename(p).lower() for p in exes}
     redist = ["redist/" + f for f in sorted(os.listdir("redist"))
-              if f.lower().endswith(".dll")] if os.path.isdir("redist") else []
+              if f.lower().endswith(".dll")
+              and f.lower() not in beside_exe] if os.path.isdir("redist") else []
 
     total = 0
     with zipfile.ZipFile(zpath, "w", zipfile.ZIP_DEFLATED, compresslevel=6) as z:
@@ -172,15 +177,24 @@ def main():
           % (len(bats) + len(exes) + len(tracked), total / 1048576.0,
              zsz / 1048576.0))
 
-    # Crash-forensics: archive this build's PDB next to the zip (operator-side
-    # only, never shipped) so the [crash] btl4+0xNNNN offsets in player logs
-    # stay resolvable per distributed version.
-    pdb = "build/Release/btl4.pdb"
-    if os.path.exists(pdb):
-        import shutil
-        pdb_dest = zpath[:-4] + ".pdb"
-        shutil.copyfile(pdb, pdb_dest)
-        print("  symbols archived: %s" % pdb_dest)
+    # Crash-forensics: archive this build's symbols next to the zip (operator-
+    # side only, never shipped) so the [crash] btl4+0xNNNN offsets in player
+    # logs stay resolvable per distributed version.  BOTH files:
+    #   .pdb  full symbols, for cdb/WinDbg
+    #   .map  plain text -- tools/symcrash.py resolves an offset with NO
+    #         debugger installed, which is the common case on an operator box.
+    # Keep them: once a version is in players' hands its symbols are the only
+    # way to read a crash it produces.
+    import shutil
+    for src, ext in (("build/Release/btl4.pdb", ".pdb"),
+                     ("build/Release/btl4.map", ".map")):
+        if os.path.exists(src):
+            dest = zpath[:-4] + ext
+            shutil.copyfile(src, dest)
+            print("  symbols archived: %s" % dest)
+        else:
+            print("  WARNING: %s missing -- a crash in this build will NOT be "
+                  "resolvable (need /Zi + /DEBUG + /MAP)" % src)
 
 if __name__ == "__main__":
     main()