snagproj to jpg conversion represents export of SnagIt projects to JPEG pictures, something that might be only doable with the original software. These .snagproj files contains projects of screen captures / video recordings and you cannot open them in standard graphics programs. If you struggle with such export somehow, it might be best to reach out to the SnagIt support or perhaps to reach out to the online community.
Updated: August 30, 2023