Movies split across multiple files

Is there a particular naming convention that can be used to support imported local movies that are split across multiple files? Plex supports this with a particular naming convention that prevents the files from showing as two (duplicate) items in the media listing, allowing it to know they are parts of the same movie and also play them in succession. Reference Link (Movies split across multiple files section).
I tried a couple of them like *part1, *pt1, etc. but it didn't seem to make any difference.

Not that big a deal these days - just curious. Keep up the great work - 'love Channels!

Multiple part videos are not supported and won’t be.

There’s ways to merge these files into a single file file to avoid this.

Are these old xvids?

OK, that's what I figured but just wanted to confirm. I do believe they're all going to be old xvids. I'm working to slowly replace them - just trying to clean things up a bit in the Library. Thanks for the info!