Linking a file type to an application

I have searched high and low but cannot find out how to do this. I want to be able to automatically load LibreOffice when I click on one of the Open Document file types, but it tells me that there is no preferred application to open the file. It proceeds to ask if I would like to find a suitable application, and goes on to list the possibilities.

Which is fine, except for the fact that neither LibreOffice nor its constituent parts are listed.

What should I do? I’m hoping the answer is as simple as fixing my Ctrl key problem.

Thanks.

Select the file with filetype and search for you program to start.

Easiest is to select a file and click on “Open with…” of its context menu. In the opening panel, select an application and click “Open and make preferred” (check the User Guide).
This only works, if the app correctly reports what filr types it supports. Which LibreOffice apparently doesn’t…

So that only leaves opening the FileTypes preferences, find e.g.
“OpenDocument Spreadsheet” under “application” and find/select “LibreOffice” as preferred application.

Sadly, even that isn’t working completely, as LibreOffice opens on double-clicking the file, but it starts with some Launcher window…

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This is an example of where theory and practice don’t tie in as they should.

Thanks to both for the attempt to help; fortunately it’s not a major issue.