File created in the Managed Object Format (MOF) that describes Common Information Model (CIM) classes; defines textual descriptions of classes that are used by a provider to return data; commonly used to change Windows Management Instrumentation (WMI) settings and to transfer them between computers.

MOF files are programmed in a language derived from the Microsoft Visual C++ syntax. They can can be compiled into the WMI repository using the program Mofcomp.exe. They typically are bundled with a corresponding .DLL file, which contains the skeleton code that returns the data defined in the MOF file. The MOF file format and compiler were developed by the Desktop Management Task Force (DMTF).