Looking for a simple rtf file thumbnail or viewer

I’ve been using a journal/diary app for years but it’s designed for Windows. Keeping it working in Linux via WINE is becoming more of a problem than it’s worth. Every time wine is updated I spend a couple of days fighting to figure out what broke.

I can export the entries to individual files but finding what I’m looking for is a problem. I have thousands of entries. Has anyone come across a “file viewer” that would allow me to peek at previews similar to a photo viewer without having to open dozens of files?

There are file manager that deliver previews for text based files. I think it was Dolphin or Nautilus, but I don’t remember. I’m sure it is the default file manager for KDE, though. So might look in to that one.