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I am using this with Windows 7 and first used to unpack a textures file and the bar at the bottom kept going on forever (~ 30 min). Then I used it to compile it and even that seemed like an unending process. In both scenarios the resultant folder and file size were not increasing with time, so I guess there wasn't really any progress although being indicated. Any suggestions?

Texturetool is checking in background if theres any cmd process still ongoing, if not, its done.
if you had any cmd processes running, please end them, and try again.