| 13o | RINEX Observation Data |
| 3dd | ArcGlobe Document |
| a2e | ArcGIS Option Data |
| adp | SIA dataMap GIS Export |
| adrg | ARC Digitized Raster Graphics |
| agf | ESRI Atlas GIS File |
| agr | ESRI ArcGIS Ascii Grid |
| agv | ArcGIS Video Metadata |
| aid | MapInfo Access ID File |
| aih | ArcGIS Optional Index |
| ain | ArcGIS Optional Index |
| alg | ER Mapper Algorithm Data |
| an1 | Street Atlas USA Draw File |
| anr | DeLorme Street Atlas Route Data |
| apr | ArcView Project |
| aprx | ArcGIS Pro Project |
| aptx | ArcGIS Pro Project Template |
| aqx | AlpineQuest XML Map |
| asrp | Arc Standard Raster Product Data |
| at5 | Lowrance Sonar Raster Map |
| atf | SOCET SET Triangulation File |
| atx | ArcGIS Attribute Index |
| aux | ArcGIS Auxilliary File |
| avl | ArcView Legend Template |
| avx | ArcView Extension |
| bcr | PTV Map&Guide Station List File |
| bds | Cadcorp SIS Base Dataset |
| bgd | USU TauDEM Binary Grid |
| bilw | ArcGIS BIL World File |
| blw | ArcGIS BIL World File |
