You can try 2 things...
First create a file with a name that WIN2k will accept, e.g. 'htaccess.txt', 'ht.acl' and then either...
- in a DOS window rename it to .htaccess
- or in yout httpd.conf file set this new file name as your access filename, i.e.
AccessFileName ht.acl
Good luck.
Jub