Please see my comment to the question. In noticed it from this and other answers. What typically try to do is based on a big misconception. Processes are well isolated, so trying to "integrate" some existing code by just running it is a wrong idea. Developers of OS tried hard to prevent it, why pushing the limits for the needs of regular applications, not complicated system utilities?
You really need to learn using libraries, not applications.
Take ZIP compression/decompression. Here is the right approach: consider using one of the following the following alternatives:
I would also add SevenZipSharp, a .NET wrapper of the famous 7-Zip:http://en.wikipedia.org/wiki/7-Zip