New user, needs help

[Shellman035]

I am trying to get Industry giant 2 to play on my computer. I am having copy protection issues. The games manufacturer is no help as I've tried repeatedly to resolve this issue with them.
My brother recommended that I go to "gamecopyworld.com" and download a file to stop the copyprotection.
I have:
1. installed the game
2. installed the add-on
3. downloaded and installed the patch. (but it is version 2.2)
4. i've downloaded the correct archived file to my desktop.

Now I'm stuck. The site says to replace two files within the game with the ones I just downloaded, but I don't know how to do this. The file I downloaded to my desktop is unable to be "explored" and I cannot open it.
I can get into the game files and have found (I think) the files to remove but I don't know how to get the downloaded file into the game. Windows asks what program I want to open the file with, and I have no idea. Maybe it's a compressed file? what do I do with it?
The file on my desktop is "idx-ig2a21"
Could anyone help instruct me how to get this file to replace the two from the game?