XnView Software

I've never heard of .craft files, but an internet search throws up this site, which may be of some help: https://file.org/extension/craft

If you are using Ubuntu, you can install gstreamer via Synaptic, the package manager. See other posts for which gstreamer version you need for XnViewMP.

Another way of playing videos (which I use) is via an associated program, e.g. VLC. In Settings, go to File List and then make sure that ...

I've just finished a 5,000 word beginner's guide. I would like to make it available via this site, e.g. as a free PDF download, if that's possible.