Memory-Mapped File Information
A memory-mapped file (or file mapping) is the result of associating a file's contents with a portion of the virtual address space of a process. It can be used to share a file or memory between two or more processes.
The GetMappedFileName function receives a process handle and a pointer to an address as input. If the address is within a memory-mapped file in the virtual address space of the process, the function returns the name of the memory-mapped file. The file names returned by GetMappedFileName use device form, rather than drive letters. For example, the file name c:\winnt\system32\ctype.nls would look like this in device form:
For more information about memory-mapped files, see File Mapping. For an example that converts file names in device form to drive letters, see Obtaining a File Name From a File Handle.