msix: fix backslash escaping in map file generation

Using sed with Windows paths in the replacement string causes
backslash sequences like \a and \b to be interpreted as special
characters, mangling the paths. Use a shell while-read loop instead
to avoid escaping issues entirely.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Shmueli Englard <senglard@microsoft.com>

Author: shmuelie

msix/release.sh

@@ -192,8 +192,10 @@ echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/Square44x44Logo.scale-200.png\" \"A
 echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/Square44x44Logo.targetsize-24_altform-unplated.png\" \"Assets/Square44x44Logo.targetsize-24_altform-unplated.png\"" >>"$MAPFILE" &&
 echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/StoreLogo.png\" \"Assets/StoreLogo.png\"" >>"$MAPFILE" &&
 MSYS_ROOT="$(cygpath -aw /)" &&
-echo "$LIST" |
-sed -e 'y/\//\\/' -e "s|.*|\"$MSYS_ROOT\\\\&\" \"&\"|" >>"$MAPFILE"
+echo "$LIST" | while IFS= read -r entry; do
+	winpath="${entry//\//\\}"
+	echo "\"$MSYS_ROOT\\$winpath\" \"$winpath\""
+done >>"$MAPFILE"
 
 MSYS_NO_PATHCONV=1 "$MAKEAPPX" pack /v /o /f "$(cygpath -aw "$MAPFILE")" /p "$(cygpath -aw "$TARGET")" &&
 echo "Package created at $TARGET"