The REG - Registry File is a file that when ran, allows the Windows Registry to update. This file will allow the user to generate custom REG files that will be able to alter different Windows functions. It also will allow the user to generate a personal customized registry update file by going to REGedit and selecting the particular registry section that you intend to modify located in the file menu, selecting Export then clicking “Selected Branch” out of the Export Range option. Please be warned that updating the Windows registry manually is an extremely complicated and advanced procedure and only those that are well versed in dealing with the technical knowledge necessary to perform this particular procedure should attempt to do so. Incorrect updates of the Windows registry can disable the operating system and cause you to lose valuable information that may not be able to be recovered.