OSH wrote on 2022-03-30, 13:52:

But after start I'm still on volume Z:.

Yes, as expected. Exactly as if you had typed the command.

Ok, but what should I insert into dosbox.conf to force DOSBOX automount this volume?
Was sollte ich in die Datei dosbox.conf eintragen, damit DOSBOX dieses Laufwerk automatisch montiert?

The question is just wrong. What you probably want is to put "C:" on the next line.

But if I type C: after start DOSBOX (with this line), I got a message „Volume C is not mounted”. So if I put this C: into dosbox.conf, will it work? I doubt it. Under Windows I haven't put "C:". Drive C is mounted without this. And I see, this command is visible in DOSBOX window too. But under MacOS isn't. And isn't work, as I supposed.

Try using the full path starting with /Volumes/Hard Drive/etc.. DOSBox, just like all my Windows virtual machines in VMWare/VirtualBox/etc, doesn't know where /Users is without any reference, you have to use the full path. Its working perfectly fine here on the latest Monterey just as it has in every other Mac OS/OS X for about a decade now.

Yes, It was problem with hidden system files. Now works . Thanks. 😀