*.enc and the crypt command

Is anybody familiar with the `crypt` command, or script. I have a file in *.enc format and the instructions I get with it are as follows: crypt < filename.enc > filename.tar.Z Any words of advice on what "crypt" is? The distributor of the .enc file seems to expect me to have this file on either Solaris or *** *** Linux. I don't want to buy *** *** Linux!!!!!!!!!!!!!!!! Thanks, Steve