Originally Posted by Greenpower
There is a glitch about war3 image extractor.
You can use image extractor as mpq or if you have mpq master. I tried to convert from TGA to BLP with Image extractor and it does not work.
Use Warcraft 3 viewer as a converter TGA to BLP
What version are you using? I use image extractor II and it works fine for me. Warcraft 3 viewer is good, but sometimes may give you problems with alpha channels.