If you legitimatly own the file you may have access to recover it as mentioned earlier. Was this file or computer on a Domain or Workgroup environment?

What happend to the server/computer that it was stored on?

A little background information will help us to help you.

Dont worry about being negged, if you are here for ligitimate reasons we will know :-)

I also recommend doing a search in AO and Google for "EFS recovery agent" this may help you understand a little about what you are up against.