In the latest versions of Adobe Photoshop with the inclusion of Adobe Bridge the thumbnail view of PSD files within the windows explorer is no more present, This can be really difficult if you intent to see preview of the file you need to open the Adobe Bridge inorder to view the preview, which consumes a lot of RAM.
Another way is to restore the the thumbnail view for the PSD files within explorer.
Here’s how to restore thumbnails for PSD in explorer
The psd thumbnail view is not included by design in the lastest version of photoshop. To restore this feature follow these steps:
1. Download psicon.dll
2. Place the DLL in C:\Program Files\Common Files\Adobe\Shell\
3. Thumbnail previews of PSD files are now back
The psicon.dll can be downloaded from here.