Attachment names were not stripped of their path components on Windows.

ChangeLog

@@ -1,5 +1,10 @@
 2003-09-19  Moritz Bunkus  <moritz@bunkus.org>
 
+        * mkvmerge: bugfix: If attachments were given with path components
+        then the path component wasn't discarded for the attachment's
+        description on Windows (normally only the file name should be used
+        as the attachment's name).
+
         * mmg: Fixed wrong order of the options --chapters,
         --chapter-language and --chapter-charset.
 

src/mkvmerge.cpp

@@ -891,9 +891,9 @@ static void render_attachments(IOCallback *out) {
           attch->mime_type;
 
       name = &attch->name[strlen(attch->name) - 1];
-      while ((name != attch->name) && (*name != '/'))
+      while ((name != attch->name) && (*name != PATHSEP))
         name--;
-      if (*name == '/')
+      if (*name == PATHSEP)
         name++;
       if (*name == 0)
         die("Internal error: *name == 0 on %d.", __LINE__);

src/os.h

@@ -44,4 +44,10 @@
 #include <stdint.h>
 #endif // !COMP_CYGWIN
 
+#if defined(SYS_WINDOWS)
+# define PATHSEP '\\'
+#else
+# define PATHSEP '/'
+#endif
+
 #endif