Going back to setting file permissions for a second, you can do so by using SetFileMode <file>,%110110110. This allows read/write access to all three user types (forget what they are, but this also works for Mac and Linux).
As for the virtualisation thing, I haven't had this problem with my tests. My games have saved the high score files in the same folder as the game without any problems. I've checked by physically viewing the Program Files folder in both my normal admin account and a standard account. Pretty sure I've checked with both UAC enabled and disabled. I have yet to work out whether this is something to do with what BlitzMax may be doing when compiling the program, or my installer (I use QSetup).
As for the virtualisation thing, I haven't had this problem with my tests. My games have saved the high score files in the same folder as the game without any problems. I've checked by physically viewing the Program Files folder in both my normal admin account and a standard account. Pretty sure I've checked with both UAC enabled and disabled. I have yet to work out whether this is something to do with what BlitzMax may be doing when compiling the program, or my installer (I use QSetup).