Conversion of themepack files to jpg file format

It appears that it is not possible to do direct themepack to jpg conversion, i.e. convert Windows themes (.themepack) as a JPEG pictures (.jpg). As is common Windows OS,  .themepack files are basically just compressed archives (CAB), so if you are looking for the wallpapers from the theme, simply extract it from archive using any file archiver that supports CAB format.

Open THEMEPACK file    Open JPG file