| .CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | SWAT | Grassland, Soil and Water Research Laboratory |
| .CST | Smith Micro Software | Page Layout Files | Manga Studio Story File | SWAT | Grassland, Soil and Water Research Laboratory |
| .DAT | Unknown Developer | Game Files | Game Data | SWAT | Grassland, Soil and Water Research Laboratory |
| .FIG | Open Source | Vector Image Files | Xfig Drawing | SWAT | Grassland, Soil and Water Research Laboratory |
| .GW | Grassland, Soil and Water Research Laboratory | Data Files | SWAT Groundwater Input Data | SWAT | Grassland, Soil and Water Research Laboratory |
| .PCP | Microsoft Corporation | Developer Files | Windows Installer Patch Creation Properties File | SWAT | Grassland, Soil and Water Research Laboratory |
| .PET | Larry Short, Mick Amadio and Puppy community | Compressed Files | Puppy Linux Install Package | SWAT | Grassland, Soil and Water Research Laboratory |
| .RCH | Grassland, Soil and Water Research Laboratory | Data Files | SWAT Reach Output File | SWAT | Grassland, Soil and Water Research Laboratory |
| .RTE | Autodesk, Inc. | Data Files | Revit Project Template | SWAT | Grassland, Soil and Water Research Laboratory |
| .SBS | Allegorithmic | Settings Files | Substance Package | SWAT | Grassland, Soil and Water Research Laboratory |
| .SEP | PictView software | Raster Image Files | Separated Image File | SWAT | Grassland, Soil and Water Research Laboratory |
| .TMP | Mozilla | Backup Files | General Temporary File | SWAT | Grassland, Soil and Water Research Laboratory |
| .WGN | Grassland, Soil and Water Research Laboratory | Data Files | SWAT Weather Generator Input | SWAT | Grassland, Soil and Water Research Laboratory |
| .WUS | WUSSOFT | Audio Files | WUTG Tagged Audio File | SWAT | Grassland, Soil and Water Research Laboratory |
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