An INF file (stands for information) or Setup Information file, is a plain text file used by Microsoft Windows for installation of software and drivers. INF files are most commonly used for installing device drivers for hardware components. Windows includes IExpress.exe for the creation of INF-based installations. INF files are part of the Windows Setup API.
A computer tech must have INF file for him to install driver manually this only have a minimum size.
Here are the Fallowing inside my INF driver I have Audio, Board, LAN, Notebook, and Wlan.