Windows 95 boot disk lacks XCOPY
Accordingly I was not able to install Windows 95 in VirtualBox as described here:
https://www.howtogeek.com/329301/how-to-install-windows-95-in-a-virtual-machine/
(I do not know if there are other ways offhand.)
But I have good news! I found a disk image that does have this important utility:
https://www.allbootdisks.com/download/95.html
I am currently installing Windows 95 in VirtualBox using disk image B and it's coming along nicely.
Comments
There's not really any reason to use XCOPY. Just use regular copy. That's kind of an odd way to tell you to do it on that tutorial. I do it this way:
md C:\Windows\Options\Cabs
Copy X:\Win95 C:\Windows\Options\Cabs
cd \Windows\Options\Cabs
Then run setup
IIRC there are xcopy and other DOS tools located somewhere on the Windows CD - the stuff that the "rescue-floppy" is made from while running setup.