windows has never displayed tga previews, psd preview support seems to have been dropped in win 7. There is an option to turn on thumbnails in win 7 , but as I say suppoort for various formats is sketchy to say the least
I use xnview for most of my image work however I need to view image thumbnails in windows explorer if i'm loading an alpha in zbrush etc. Thumbnails have never displayed for me in windows 7 (64bit home edition) and upon searching this problem many people have had it and the solution seems to be to check the box 'show…