GUnite and .gsd files with no GSplit tags

Hello there just seeing if anyone can look into this. My friend recently received a video broken into 8 .gsd parts, but anytime I try and unite them I get the same message (No gsplit tags, unrecognizable). I know there’s another thread that’s similar but this problem is slightly different. Any thoughts / suggestions would be highly appreciated!

GUnite can’t unite files without GSplit tags. We’ll offer this feature in a future version. Until that, if your pieces have no tags, you can unite them with any file merger tool, or create a batch file (.BAT) with the copy /b command.