.dem
| File Type 1 |
 Video Game Demo File |
| File Format |
Proprietary (Valve) |
| Usage |
Open manually; may run a program or script when opened |
| Rank |
★ ★ ★ Common |
| Description |
Demo of a commercial video game; typically an in-game recording that serves as an example of the gameplay; used by games such as Half-Life, HalfLife: Counter-Strike, Quake, Hexen, and Unreal Tournament.
|
| Open With |
| Windows |
 Valve Counter-Strike
id Software Quake
 id Software Hexen 2
|
| macOS |
Valve Counter-Strike id Software Quake |
|
| Updated |
June 9, 2009 |
| File Type 2 |
Digital Elevation Model |
| File Format |
Standard (developed by USGS) |
| Usage |
Open manually |
| Rank |
★ ☆ ☆ Uncommon |
| Description |
Contains mapping data with elevation information; used by the US Geological Survey.
|
| Open With |
| Windows |
 ESRI ArcGIS for Desktop
 Golden Software Voxler
 TatukGIS Viewer
|
|
| Updated |
2007 |
|
