找到了 http://www.suu-design.com/downloads.html
看:
Attention !
If you have the Steam version of X3 or if you have missing registry entries, the map-installer can't find your X3 folder to setup the script. Just enter the correct path to your X3 folder in this (mirror) reg-file, run the reg-file and submit the changes to fix the problem.
点那个链接下载个reg文件,编辑,把路径改成你的X3目录,保存导入.再重新安装X3MAP,就可以把脚本装到游戏目录了