I received on an old Zip disk a FreeHand 9 file, which was created on Mac OS Classic around 2003. The file has no extension, only thanks to the file tool I was able to find out that it is in fact a Macromedia FreeHand 9 document. And while adding the extension fh9 doesn't give me the option to open it with Affinity Designer, the extension fh10 does. Sadly it says it is not supported.
I guess my only chance would be to find an old Mac with FreeHand 9 to actually see the file and create an PDF for my archive, which is my aim for this project.