In particular these are OpenStep-4.2-intel boot floppies. These floppy images work just fine with Parallels. Since I want to run OpenStep in the background to replace aging hardware, it's either Parallels Server (at a ridiculous price of $1200+) or VirtualBox at a reasonable price ($0).
However, the floppy images I have are rejected by VirtualBox, even though they work just fine with Parallels. An attempt at converting them with
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VBoxManage convertdd 4.2_Install_Disk.fdd 4.2_Install_Disk.vdi