Here's another method you can try https://rapidshare.com/files/2108524508/MPQ_editor_open_mpq_with_list_file.rar
, open up one of the mpq files from diablo something should be identified, once you do that. You should see all the variables listed for the game, once you have the list of assets, you can narrow down your search, if your just pulling labels this is something to try.
Open MPQ Editor, and drag the mpq file in the window, a dialogue box will pop up, now click the "list" button, and select the list file from the wcx_mpq pack. This is susposed to list the entries for diablo 1/2, starcraft/broodwar, and warcraft 1/2/3. I've only used this with broodwar to edit a few assets.