I wanted to point out that DevIL now supports .tpl files. However, I was unable to get the code to ThumbView to compile due to missing files. I may take another try at some point.
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.tpl is an image format used for Wii dev. I can't find any other thumnail proggie that supports it. Here's a spec.
http://hitmen.c02.at/files/yagcd/yagcd/chap15.html#sec15.35
ThumbView is great, thanks for sharing it.
I wanted to point out that DevIL now supports .tpl files. However, I was unable to get the code to ThumbView to compile due to missing files. I may take another try at some point.