Document class tex not recognised by Zettlr

Hi,
This problem is specific to Zettlr, but I think the cause may be more system-level. I’ll ask this question also with Zettlr and report back.
Normally, you can open and edit tex-files with Zettlr. My system doesn’t show Zettlr as application to open tex-files with. Even a tex-file made with Zettlr, is not visible if you choose open from Zettlr’s menu and it’s not in the recent files menu.
I’m using the Flathub version, maybe I could try the AppImage.

I only need Zettlr to recognise the file type, because I have my own export profile. There you have to point to the tex file, but it’s not recognised there either.

EDIT:
With the app-image, you can open a tex-file with Zettlr, it shows in the menu. It also shows when you choose “open”, but there it’s greyed out.

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For future reference:
I still can’t see or open tex files with the Flathub version of Zettlr, but you need Flatseal to give Zettlr the rights to access e.g. your home directory.
That solved my exporting to pdf-problem (with custom profile, but that didn’t had anything to do with it)
Maybe I have to give Zettlr more permissions to let it be in the “open with” menu for tex-files.