IntelliJ IDEA can't open *.cfg files

Question

*.cfg files in Idea won't open after restart. Here's the way they are indented in Project window.

I'm pretty much sure that files are not corrupted, as they do nicely open in notepad. Also, any other types of files open easily, it's just for *.cfg's.

I've tried to reload IDEA, and invalidate cache, no result. IDEA 2017.2.7 Community.

Any advices would be appreciated. Thank you.

Answer 1

Looks like some custom plugin is installed and associated with *.cfg files. Please try to disable custom plugins in "Settings | Plugins".