You can find your minecraft.jar file on a windows PC by clicking on start in your toolbar at the bottom of the screen and click 'Run'. If the 'Run' button isn't there, use the search bar a the bottom of the start screen and search 'Run'. Then a Window with a text box will come up, in the text box you must type inand then you need to click on .minecraft and then click bin. In the bin folder you will see a file called ether 'minecraft.jar' or 'minecraft'. To open this file, You must have WinRAR archiver or 7zip or whatever. You can get WinRAR archiver at the link under "Sources and related links" below this answer.
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premium: get the 1.0.0 Minecraft jar here modsforminecraft.com/ and delete the Minecraft jar that you have and put the 1.0.0 jar in
find a .minecraft folder with zombiecraft already installed then replace it with your normal .minecraft then run the .jar file but DONT force update (minecraft 1.1)
download it then chuck its contents in a mods folder in minecraft .jar
You need an a jar from alpha stages, which you can get with Minecraft Nostalgia.
You need to have java 6 or later installed on your mac for a minecraft server jar to open correctly. If this doesn't work you can use a terminal command to run the jar.