.mdl
| File Type 1 |
 DigiTrakker Module |
| File Format |
Proprietary (Prodatron) |
| Usage |
Open manually |
| Popularity |
★ ★ ☆ ☆ ☆ Uncommon |
| Description |
Audio tracking module format used by the DigiTrakker music tracking program.
|
| Open With |
| Windows |
 OpenMPT
 MODPlug Player
|
| macOS |
 CocoModX
|
|
| Updated |
2007 |
| File Type 2 |
 Half-Life Model File |
| File Format |
Proprietary (Valve) |
| Usage |
Open manually; may be referenced by an application |
| Popularity |
★ ★ ★ ★ ☆ Common |
| Description |
Three-dimensional model used for characters and creatures in the Half-Life video game; created using polygons and texture mapping for detail; can be seen from different views (wireframe, flatshaded, smoothshaded, and textured) using the Half-Life Model Viewer.
Important: QC files are actually used by Valve's Source game engine, so they are not restricted to Half-Life models.
|
| Open With |
| Windows |
 chUmbaLum sOft Half-Life Model Viewer
 chUmbaLum sOft MilkShape 3D
 MDLDecompiler
|
| macOS |
Valve Half-Life 2 |
| Unix |
chUmbaLum sOft Half-Life Model Viewer |
|
| Updated |
2007 |
| File Type 3 |
Rational Rose Model File |
| File Format |
Proprietary (IBM) |
| Usage |
Open manually |
| Popularity |
★ ★ ★ ☆ ☆ Average |
| 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.
|
| Open With |
| Windows |
IBM Rational Rose
|
| Unix |
IBM Rational Rose |
|
| Updated |
2007 |
| File Type 4 |
Flight Simulator Airplane Model |
| File Format |
Proprietary (N/A) |
| Usage |
Open manually |
| Popularity |
★ ★ ★ ☆ ☆ Average |
| 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.
|
| Open With |
| Windows |
 Microsoft Flight Simulator
|
|
| Updated |
2007 |
| File Type 5 |
MathWorks Simulink Model |
| File Format |
Standard (developed by MathWorks) |
| Usage |
Open manually |
| Popularity |
★ ★ ★ ★ ☆ Common |
| Description |
The MDL format is a standard text-based format used by Simulink for saving simulation models. Each MDL file includes a list of elements, which each contain a list of values. The model data can be parsed by Simulink and displayed visually within the program.
Important: Until 2012, the MDL format was the standard model format used by Simulink. It has since been replaced by the newer .SLX format.
 About MathWorks Simulink
MathWorks Simulink is a scientific application designed for performing simulation and creating model-based designs. It supports system-level design, automatic code generation, and continuous testing. The program includes a graphical editor, customizable block libraries, and "solvers," which can be used to model dynamic systems. Simulation results can be exported to MATLAB, MathWorks' technical computing application.
|
| Open With |
| Windows |
MathWorks Simulink
|
| macOS |
MathWorks Simulink |
| Unix |
MathWorks Simulink |
|
| Updated |
January 28, 2013 |
|
