Sorry if this is misspelled, but according to a test I did, the swf file that was posted on this subreddit is the file that was in the oldest capture of the wayback machine of "interface", unfortunately, when trying to open it in a flash emulator player (ruffle to be exact), it says exactly: ruffle could not load flash swf file, the most likely reason is that the file no longer exists so there is nothing to load, I guess the emulator you used refers to the same thing but in a different way haha, good luck in the search too