You are right, cvs2svnin this case it is not reliable, as the CVS Frequently Asked Questions :
CVSNT is a version control system that began by adding support for running CVS under Windows NT. Since then, he has made many extensions to the RCS file to such an extent that compatibility with CVS does not imply compatibility of CVSNT with any degree of certainty.
cvs2svn CVSNT, - CVSNT, , , .
CVSNT, , :
- cvs2svn
--use-cvs. - CVSNT- cvs (.. , cvs
$PATH , CVSNT). - , , - .
--use-cvs: ( ).