In older releases of Illustrator I could actually open a .cgm file and view/select the line art.
With the newer releases that came out within 2020-2022 I couldn't even open a .cgm (until very recently), even though Adobe said this was one of the supported files in Illustrator. I would immediately receive an error that .cgm was not a supported file type.
This problem has now gone from, I can't open it at all, to I can only open it as a text file. I'm not given a choice, I have to open it this way. This is useless to me. I am at v26.2.1, and I can open a .cgm file without an error, but all I can see is the metadata in text format. There is no line art. This is extremely frustrating and it has been going on for a very long time.
WHEN WILL ADOBE FIX THIS ISSUE?! We all pay good money to use these programs, this should have been fixed long ago.
Perhaps you need to develop a plug-in for this ability??