File extension mp7 is used by following file type(s):

File extension mp7 file type 1 description:
NI Multisim v7 project file

The MP7 file extension is associated with Multisim, an electronic circuit simulator, developed by National Instruments Corporation.

An .mp7 file contains project created and saved in Multisim version 7 that references a MS7 circuit design file. The latest version of NI Multisim uses the MP11 file extension instead.

Programs
that open mp7 files:
NI Multisim (Microsoft Windows)

 

File extension mp7 file type 2 description:
Portable Media player 7 file

The MP7 file extension is reported to be used in Portable Media Player 7 multimedia device for video files. Portable Media Player was one of the PMP devices sold around 2009, average in nature and overpriced it didn't met much success.