HI there
001 ARE files extension and u need all file to join then can view
when theres 001, surely there are 002 003 004 005 006 so on so on.
then only u get a software called hjsplit and joined then all up
then only its viewable.
to get the file called HJsplit click at this link
http://www.freebytesoftware.com/download/hjsplit.zip
unzip this file and u can start joing up all those files with 001