XnView Software

Anybody may know if it is in general normal to have no thumbnails for mp4-files. Would be nice to know so I can stop to try to get it to work - thanks!

First a big hello to this forum (my first post) XnView is great so thank you very much for this great tool!!!
I have the same problem I don't have thumbnails for mp4-files (they play in preview though) all other videofiles show thumbnails (avi,mov,flv etc) with the exception of m2ts (it doesn't play ...