diff --git a/scripts/ci/compile-windows.sh b/scripts/ci/compile-windows.sh
index 357ffe3..9f18390 100755
--- a/scripts/ci/compile-windows.sh
+++ b/scripts/ci/compile-windows.sh
@@ -109,9 +109,17 @@ ISS="${BUILD_CLIENT}/windows/installer/pangolin.iss"
 sed -i "s/^#define MyAppVersion .*/#define MyAppVersion \"${VER}\"/" "$ISS"
 
 echo "==> building installer with Inno Setup (version ${VER})"
-# MSYS_NO_PATHCONV / MSYS2_ARG_CONV_EXCL disable Git Bash's automatic conversion
-# of paths, matching jiu's ISCC invocation fix.
-MSYS_NO_PATHCONV=1 MSYS2_ARG_CONV_EXCL='*' "$ISCC" "$ISS"
+# ISCC 是原生 Windows 程序,只认 Windows 路径(C:\...);传 MSYS 风格 /c/... 会被它
+# 当成选项 → "Unknown option: /c/...pangolin.iss"。故先用 cygpath 把 .iss 转成
+# Windows 路径再传(jiu 是直接写死 C:\ 字面量;这里用 cygpath 更稳)。
+# 不用 $() 命令替换(仓库约定):cygpath 输出落临时文件、read 读回。
+cygpath -w "$ISS" > /tmp/pangolin_iss_win.$$
+ISS_WIN=""
+read -r ISS_WIN < /tmp/pangolin_iss_win.$$
+rm -f /tmp/pangolin_iss_win.$$
+# MSYS_NO_PATHCONV / MSYS2_ARG_CONV_EXCL 关掉 Git Bash 对 /-开头参数的自动路径转换
+# (否则会把 .iss 里将来可能的 /D 定义也改坏)。ISS_WIN 已是 Windows 路径,原样传即可。
+MSYS_NO_PATHCONV=1 MSYS2_ARG_CONV_EXCL='*' "$ISCC" "$ISS_WIN"
 
 # pangolin.iss has no explicit OutputDir -> Inno defaults to {src}\Output
 # (relative to the .iss file), filename OutputBaseFilename=pangolin-setup-<ver>.