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.MDL File Extension


File Type 1 DigiTrakker Module  (Most common)
File Format File
Common? No
File Description Audio tracking module format used by the DigiTrakker music tracking program
Program(s) that open mdl files Mac: CocoModX
Windows: Prodatron DigiTrakker or n-Play; MODPlug Player

File Type 2 Simulink Model File
File Format File
Common? No
File Description Simulation model created with Simulink Simulation and Model-Based Design software; contains the block diagram and block properties of the simulation.
Program(s) that open mdl files Mac / Windows / Unix: The MathWorks Simulink

File Type 3 Flight Simulator Airplane Model
File Format File
Common? No
File Description Three-dimensional model of an airplane or other aircraft used by Microsoft Flight Simulator; standard model format used by multiple versions of the Flight Simulator series.
Program(s) that open mdl files Windows: Microsoft Flight Simulator or Combat Flight Simulator; The MDL Converter Tool

File Type 4 Rational Rose Model File
File Format File
Common? No
File Description Diagram or model created by Rational Rose software; used for modeling software architecture and design, and creating business models that improve predictability and productivity.
Program(s) that open mdl files Windows / Unix: IBM Rational Rose

File Type 5 Half-Life Model File
File Format Proprietary File
Common? No
File Description Three-dimensional model used for characters and creatures in the Half-Life video game; created using polygons and texture mapping for detail; different 3D views, such as wireframe, flatshaded, smoothshaded, and textured, can be seen using the Half-Life Model Viewer.
Program(s) that open mdl files Windows: Half-Life Model Viewer; MilkShape 3D
Unix: Half-Life Model Viewer

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