File names with a period aren't saving correctly

I work with several projects in Photoshop that have many revisions, and I've always saved them as "Version1.2.psd", "Version4.51.psd" etc etc, without any problem, in Windows XP.

I just upgraded to Windows 7 and when I went to save my file called "Version1.2", it dropped the ".2" and tried to save it as just "Version1.psd", like it thinks my period is a mistake. I overlooked this at first because I wasn't used to it and ended up saving over another file of the same name. I can manually type in the ".2" extension and still save it how I want, but this gets annoying after a while and if I'm working quickly can easily be overlooked.

Is there any setting to fix this or is this just a very unfortunate permanent defect of Windows 7?


Edit: I also upgraded to Photoshop CS4 at the same time so I suppose that could be the culprit instead, anyone know??

Your original format should be acceptable. (I confirmed that be saving the precise name - see picture),
Maybe you accidentally slipped a space in there somewhere?
Otherwise I would go with your last sentence!



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