http://www.mediafire.com/?qcnocp1b3pc8golThere are five files in there that you would need to copy into your battlefield 1942 directory, replacing the version 1.61 files.
BF1942, BF1942.org and BF1942_w32ded would go into your root folder.
contentCrc32 and init would go into Battlefield 1942\Mods\bf1942.
It might be worth first copying the files that are going to be replaced so you still have them, just in case.
I have never done this myself but I don't see why it wouldn't work, what a patch switcher does is switch those 5 files for you.