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.MED File Extension

File Type 1	Amiga MED Sound File (Most common)
File Format	File
Common?	No
File Description	Sound tracker module created by Amiga OctaMED tracking program
Program(s) that open med files	Mac: SoundApp Windows: ModPlug Player

File Type 2	RSView Development Project
File Format	Proprietary File
Common?	No
File Description	Software development project created with RSView Studio software, such as RSView ME (Machine Edition); stores program information and references to other project files; used for creating HMI (Human Machine Interface) applications. MED files can be compiled into RSView runtime (.MER) files when completed.
Program(s) that open med files	Windows: Rockwell Automation RSView Studio or RSView ME

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/med