Instructions
Download and extract the Deprotect v2.3.1 suite from the Deprotect website.
Browse to the folder where the Deprotect suite was extracted and double-click on the Deprotect icon.
Click the "File" menu and select "Open" from the drop down list.
Browse to the folder containing the MPQ (map) file you want to open without protection. Click the MPQ (map) file and then click the "Open" button to open it in Deprotect. This will unprotect the map file.