http://en.wikibooks.org/wiki/Q3Map2

hjaelp: / og \ er det samme i cmd.exe

hjaelp: q3 kan ogsaa vaere q3a (ved ikke)
hjaelp: -game <quake3|wolf|et|etut|ef|jk2|ja|sof2|tenebrae|qfusion>


Decompiling into a .map

Q3Map2 can decompile a .bsp into a .map. This procedure is by no means perfect, and you should never take anything from others maps, but decompiling is map is good to "see how it's done".
 1.Put the .bsp that you want to decompile into the same directory as q3map2.exe
 2.Open the command prompt and browse to the folder which contains the .bsp and q3map2.exe
 3.Type


eksempel:

q3map2 -game [game abbreviation] -convert -format map [name of the bsp file].bsp

*So if the .bsp is called testmap.bsp and you use Jedi Academy, you use this:

q3map2 -game ja -convert -format map testmap.bsp
(q3map2 -game q3 -convert -format map mapname.bsp)

*You should then find a .map in the same folder as q3map2.exe and the .bsp.



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All previous answers are correct.
I'll just simplify it by doing it in single lines...

First, let's assume your *Insert Name* is 'YOURNAME'
1. Start > Run
Type "cmd" (without the quotes) then press {Enter} or press [OK]
A black window should appear with the a blinking cursor
2. Type "cd\users\YOURNAME\My Documents" (without the quotes) then press {Enter}
The text prompt should be changed to what you have typed

To see the files in that directory, type "dir" (without the quotes) and press {Enter}
To know how to use other switches of "dir" command, type "dir /?" (without the quotes)

To rename a file, say there's a file called 'myfile.txt', type "ren myfile.txt myrenamedfile.abc" (without the quotes) then press {Enter}
It is now named 'myrenamedfile.abc'
type "dir" (without the quotes) then {Enter} to see if it is

To copy a file (or files) to another directory (or to another filename), type "copy myrenamedfile.abc mycopiedfile.log" (without the quotes) then press {Enter}
To know how to use other switches of "copy", type "copy /?" (without the quotes)
type "dir" (without the quotes) then {Enter} to see

To delete a file, type "del /?" (without the quotes) then {Enter} to see how to use it

Cheers!