If you are using Galaxy Forge you
can not save your maps in the Galaxy folder using the Galaxy Forge
if you have installed the game under the Program Files folder.
If you do that Vista will move the file to the "Compatibility folder", see
WWW Link for a explanation.
Go to the Galaxy folder and click the "Show Compatibility Files" button, highlight the *.galaxy file and select Cut, go back to the Galaxy folder and paste it in. UAC will go off and require two OK before it will allow you to do it.
Of course it would be simpler if you just installed the game in a folder outside of the Program folder tree. Vista is hardwired to do this as long as the folder is under Program Files...