This is the first time I've encountered this issue with Studio 4.0. Project and app-level files not able to open, below some other file which not able to open:

Android Studio 4.0 - .csv file Not open, displays nothing.
 - .java file not open.
 - .kt file not open.

Has anyone else seen this behavior before? And solutions? Advice would be appreciated.

I have used this plugin for CSV file read <https://plugins.jetbrains.com/plugin/10037-csv-plugin> without this plugin Studio working fine.