I can use -.ext to exclude files with unneeded extensions, but when I tried to use quotes to filter wiles with a particular extension only, it didn't work. Also many times, I have felt if I could have a way to show folders only in search.

This is also for true for files that I want to make public. For example, I want to share a folder but don't want to share .nfo files or some particular files. I recently shared some pdf comics for which I had to enable sharing text files, but I could not filter out some junk in .txt which was there in the folder.