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Previewing thumbnails in Windows Explorer is nothing new but when it comes to preview other formats like jpg, gif, png etc. can be sometimes real pain.
Luckily some smart people has find a way around this with some minor hacks.
- Download psicon.dll from DLL Dump
- Place the DLL in C:\Program Files\Common Files\Adobe\Shell\
- Thumbnail previews of PSD files will now work
Note! this hack will only work with Adobe CS2 .psd files