| .3ds |
3D Studio Scene |
| .123d |
Autodesk 123D Drawing |
| .3dmk |
123D Make Project File |
| .3dp |
3DMark2011 SE Project File |
| .123dx |
123D Design Model File |
| .123c |
Autodesk 123C Drawing |
| .adt |
ACT! Document Template |
| .asc |
PGP ASCII Armored File |
| .arx |
AutoCAD Runtime Extension File |
| .ase |
Adobe Swatch Exchange File |
| .ac$ |
AutoCAD Temporary File |
| .adi |
AOMEI Backupper Disk Backup File |
| .acb |
Adobe Photoshop Color Book File |
| .atc |
AutoCAD Tool Catalog File |
| .arg |
AutoCAD Profile |
| .anim |
Maya Animation File |
| .aws |
AutoCAD Work Space File |
| .actm |
AutoCAD Action Macro File |
| .brd |
EAGLE Circuit Board File |
| .blk |
AutoCAD Block Template File |
| .bio |
BIOS File |
| .bk1 |
Autodesk Backup File |
| .bmi |
3ds Max Plug-in |
| .ctb |
AutoCAD Color-Based Plot Style File |