IndustrialCraftConfig is the Test document that alters the Block IDs in IndustrialCraft. This file was made by Alblaka, the creator of IndustrialCraft. Once again, I did not create IndustrialCraft.

Anyways, to install:
1. Have IndustrialCraft and NetherCraft v0.9 or higher installed.
2. Place the file named "IndustrialCraftConfig.txt" in your .minecraft folder.
3. To find this folder, look below.

For Windows 7 or Windows Vista:
C:\Users\[UserName]\AppData\Roaming\.minecraft

For Windows XP users:
C:\Documents and Settings\[UserName]\Application Data\.minecraft

For Linux users:
/home/Your User Name/.minecraft

For Mac OS/X:
~/Library/Application Support/minecraft

If this does not work, then I am sorry.