[Note - This information may be obsolete because BF uses punkbuster now.]
You can create the contentCrc32.con from a console or by using the start->run toolbar. First, run the command:
bf1942 +generateMapListForCrcContent 1 +game <mod name>
Notice I'm using the game executable, not the debugger. The debugger does not work for this. The command above creates a batch file in the game directory called:
getcrc-<mod name>.bat
The <mod name> is the actuall name of the mod. Run this batch file and the contentCrc32.con will be created in the mods root folder.