Decompress using code?

I would like to decompress a ZIP file, with my code, without any external DLL. (Or any other format in which I can compress to).

How to do it?

Ok have that part working using a demonstration app from http://www.vbaccelerator.com. Basically these guys have sourced the engines for winzip and built a demo vb project around it. We have used that as a basis for one of our product's features....adding in encryption etc as required by the client.

Try looking at their project, (which is cool), and modifying it to your own requirements. Actually doing it in vb code without the zip controls is probably not efficient and would be hugely challenging. Maybe Megatron or Kedaman could think their way through it. Personally l much prefer to grab a good third party control, let that do the work, and put in the effort to having a good looking user interface.

I don't need any nicely-looking controls, I am making unattended tool.

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But... If I compile the file (only one) as a resource, can I retrieve the same results as zipping it?

I mean, for example, I can add a MsWinSck.ocx or such file as resource, and if it can not be found on computer, I will extract it from exe. Bad idea?