/sbin/restore broken??!!

[Wojciech Puchar]

or maybe dump

while testing my full backup with restore -rvf, after 7-th DVD restoring 
fine, when started to restore 8-th DVD it prepends ? to every file name 
like this:

extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/a2p
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msggrep
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/gettext
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgconv
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/ngettext
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgfmt
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgcmp
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgmerge
extract file ?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgunfmt
extract file 
?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/screen-3.9.13
extract file 
?/home/kopie/3miasto.net/root/NetBSD-1-5/usr/pkg/bin/msgattrib


and of course failed to create.

i stopped restore, added symlink with

ln -s . \?

and rerun it from DVD 8 so it is able to restore files.

but what's this "?" ??!!