.MANIFEST File Extension

XML document that updates an older Windows program to use the Windows XP or Windows Vista interface; binds the application to the Comctl32.dll version 6, which gives the program the newer Windows XP/Vista appearance; also describes the dependencies that an application uses, such as the Windows common control DLLs referenced by the program.

File used by Valve Steam, a content delivery application used for downloading video games; related to .ACF files and used in the process of downloading and updating purchased games from the Steam online store.