Text file with non-standard suffix/file extension

I am really sorry for not figuring this out myself. I even guess others have asked before…

I have files with plain text that I want DT to recognise as such, but they have a non-standard file extension (.out). Currently I have to rename them prior to importing to DT for DT to recognise the content of these files.

Any solution?

Regards,
Christopher

Check out the built-in Help > Documentation > Preferences. The second paragraph has a link to hidden preferences, including one to add text extensions.