Greetings! Apologies if this has been answered before (or is documented somewhere, I didn't have much luck in my quick search)

Is it possible to get a basic file chooser parameter to work in Maya? We have an asset with a file parameter but the chooser it brings up in Maya is basically useless and doesn't allow you to select anything, or show you any actual files (only directories)

I was able to reproduce this. This is actually a bug in how file type filters were handled. The file browser should have used the *.* filter. I've just fixed the issue. The fix will be in Thursday's build (15.5.716).

Thanks Andrew!