Problem with setting structured application in new FrameMaker version

Dear all,

I have a problem with FrameMaker 2022 and I was wondering if anyone could help me. I use docbook XML and have a problem with opening xml files correctly.

When I try opening an xml file with FrameMaker 2022, it opens the "Save Book" window and tries to get me to save the xml document as a book. How can I get it to open xml files properly?

I have opened, edited and saved the said xml files with FrameMaker 2020 succesfully, but now that I want to take FrameMaker 2022 into use, I can't. I have activated Structured FrameMaker interface in Preferences.

I'm probably just missing something. Should I copy the structured application files somewhere in the new FrameMaker installation? I tried comparing the old installation (FM 2020) with the new (FM 2022), but I couldn't find any differences.

I obviously can't set the Structured application in the FrameMaker from Structure > Set Structured Application... since I cannot open any xml files to begin with.

Someone else did the pre-settings for the FrameMaker 2020 and I cannot ask them anymore. I hope you can help me.

Thank you very much!