Reminds me of the PC-98
Or as it's known in English-speaking countries, the APC-III. I somehow ended up in possession of a box of APC-III software including a MS-DOS 3.3 boot disk. Now, my PC clone (a Sharp PC-7000A) only had MS-DOS 2.11 which certain newer MS-DOS games would refuse to run on, so having a DOS 3.3 disk would be a total upgrade (mind, this was back in the days where having a hard drive meant you were stinking rich in this region, so us plebs made do with floppies, with the added advantage that they could be copied and swapped with your cousins).
Except that the disk wouldn't boot proper, it would just bootloop, showing the Sharp BIOS screen, the Starting MS-DOS message, and then reboot a second later. All the programs in the box also rebooted the system when run. I wrote it off as the box of disks being faulty and threw them aside.
I later found out that NEC had injected extra code into their version of MS-DOS for APC-III/PC-98, as well as their pack-in software, to look for a "Copyright NEC" string in the BIOS, and not finding it, reboot continuously until the machine is shut off.
Cheeky.
I later found a copy of MS-DOS 4.02 from an Epson machine and that one isn't sabotaged in that way. Sure it was widely considered the worst version of MS-DOS ever created, but it offer me reprieve in that games that previously refused to run with a "Requires MS-DOS 3.3 or Later" error could at least now make it to the title screen before locking up.