Editing Minecraft guide (section)

=== Finding minecraft.jar ===
First step is finding out where your minecraft.jar file. The easiest way to do this is:
# Start Minecraft
# In the main menu, click "mods and texture packs"
# On the next screen, click "Open texture pack folder"
# a file browser should've opened up.
# Go up one directory, find the 'bin' folder, go down in it. 'minecraft.jar'

How to open it up:
# rename 'minecraft.jar' to 'minecraft.zip'
# double-click it.
# while you're looking inside, find the 'META-INF' folder and delete it. Doesn't hurt the game, and it interferes with any mods you'd install.
# After you closed your zip viewer, remember to rename 'minecraft.zip' back to 'minecraft.jar' before you start the game.
# Should probably copy 'minecraft.jar' to 'mincraft.clean.jar' right now, in case a mod screws things up.

If you completely mess up your minecraft.jar piece, or the lwjgl stuff, just delete the 'bin' folder and it will be re-downloaded next time you start the game.