After upgrading Windows 8.1 to Windows 10 i cannot open one very important Photoshop format file. Getting 'Unknown Phoroshop format' error. I could open it before!
This could be caused by:
a) The file is not really a PSD file but is rather some other format with an incorrect .psd extension.
b) A corrupt PSD file.
You could try the menu option Open As and select the file's correct format assuming option.
Also take a look at this repair psd file link to see if it may be related: http://www.psd.repair/
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