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Want to be able to view .PSD and .TGA files as thumbnails in your explorer? Download the MysticThumbs software, install it, restart your system and BAM!

x86 Installer (32 bit OS)
x64 Installer (64 bit OS)

Source: http://tbxstudio.com/psd-thumbnail-viewer-on-windows-explorer-for-windows-7-vista-64/