Unmodifiable applications after moving from Windows XP to Windows 7
If, as I was, you are unfamiliar with NTFS security, you may encounter a problem when moving your FileMaker applications from Windows XP to Windows 7. The effect is that both regular and run-time applications appear to work fine -- except that it is impossible to change data, edit scripts, or generate new run-time applications. The usual FileMaker error message is "This action cannot be performed because this file is not modifiable".
In oversimplified terms, the problem arises when files are moved, rather than copied, to the new system in batches within their original folders. Since they are in their original parent folders, the files retain the security settings related to the original computer -- which become meaningless on the new system. The result is that the files lack the permission settings that would allow them to be modified or edited on the Windows 7 system.
To prevent the effect, create new folders on the Windows 7 system giving full administrative permissions. Then COPY the files to those folders rather than moving them. If the files have already been moved to the Windows 7 system, the cure is to create new folders on the Windows 7 system , COPY the files to the new folder (at which point they assume the security settings of the new folders), then delete the old folders and rename the new folders to the name previously used on the XP system.