about the rename operation of the office .doc file!

when saving the .doc file, office will have two rename actions, first rename .doc to ~WRL****.tmp, next rename ~WRD****.tmp to .doc.

I want to encrypt the .doc file before the second time rename action. My method is to encrypt ~WRD****.tmp to ~WRD****.ice, next rename ~WRD****.ice to ~WRD****.tmp, but this method have the permission issure.So I want to ask how can I encrypt the .doc file before the second time rename action?

another question is can I do the same rename operations as the office?
first rename away .doc file, than rename another encrypt file to the .doc file.

Thanks a lot!