How to ignore file extensions in compare?

[wimehada]

I have several movie folders from my ripped DVDs over the years, where one contains the original rip, another contains just the movie as an iso file, and another contains a converted version of the movie iso file to an m4v file (Handbrake) that's compatible across devices.

I'm noticing I'm missing some files across folders, but when I try to do a compare, it shows every file because two of the folders have different file extensions in them.

I'm not seeing an option to have WinMerge ignore the file extension so I can just compare names.