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1. Re: PS CS3 unknown file type (?)
370H55V May 28, 2010 10:23 PM (in response to auctioneer)Do you have finder set to show file extensions?
If you aren't careful when saving, and when you rename a file from untitled.psd (default for new files in PS) to (name).jpg the extension can drop if you switch the file type first and then change the name. It may appear to save it as a jpg, but if it dropped the extension, the Mac Kernel will tell PS that it is an unknown file type, or a generic document and you'll see the error. Without showing extensions in Finder, you're none the wiser when it happens.
Finder>Preferences and Advanced. Check the box to show extensions. Then look at the files to see if the extension dropped when you saved them.

