Neither of the scripts will help unless the package name is used in the job step name.  The original question was how to decrypt an encrypted DTSRUN command and the only way I've found to do that is by using the DTSrundec tool mentioned above.  I've found a compiled version here:

http://maiux.com/dr/node/21 and after unzipping it I was able to run it at a cmd prompt and decrypt an encrypted DTSRUN command.

Greg