ISO chunks combined with WiiBackupManager don't work

[TheYak]

I ripped Mariokart Wii from my Wii using CleanRip earlier tonight and since my USB Drive only had about 1.5GB of storage I had to move it onto my computer in 5 1GB chunks (fifth one is like 400MB so I guess its 4.5) and I've tried combining it using PowerShell with the command Copy /B filename+filename... which did not work at all, then used filejoiner, freeware that was suggested for a similar issue on this forum, but that did not turn up a usable file, and finally I tried WiiBackupManager, which appeared to successfully merge the file parts, and Dolphin found it, albeit with a long Japanese name and no banner icon, but the properties show Mariokart and the Wiki linked is Mariokart, so it knows what game is there. When I launch the game, it's just a black screen and gets 0 fps. The files I combined were the .iso files that shared the same name (apart from the part0,part1, and so on).

[JosJuice]

This usually means that you combined the files in the wrong order (other than part0, which must have been correctly ordered), or missed one or more files.

[TheYak]

here is a screenshot of the files that were put on the usb drive that I then moved over, with the files I combined in WBM highlighted https://imgur.com/OmcKhzA is there a file in here I need to add or should I just recombine them with the order in mind

[TheYak]

I got it working, now the only issue to solve is making it run smoothly but that should just be fiddling with dolphin settings, I finally figured out how to actually open a CMD window to the folder the parts were in and do the copy /b command which worked