| sm2 | SediMeter Field Data |
| sm3 | DataCAD Symbol File |
| sm3 | LogDator Measurement Data |
| sm3 | RHK Technology Proprietary Format Data |
| sm3 | SediMeter Field Data |
| sm3 | SediMeter Network Definition Data |
| sm4 | LogDator Measurement Data |
| sm4 | RHK Technology Proprietary Format Data |
| sm4 | SediMeter Field Data |
| sm4 | SediMeter Network Definition Data |
| sm4 | XPMPro 2.0 Data |
| sm5 | SediMeter Field Data |
| sm7 | SAS Multi-dimensional Database |
| sma | Scrapbook Factory Album |
| sma | SmartPlant Enhanced Report |
| smap | WHAMM Segment Map File |
| smb | Autodesk Mapguide Symbol Library |
| smc | HP Smart Message Center Cache |
| smc | SNES ROM Image SMC |
| smc | Solibri Model Checker Model |
| smc | Soundweb Designer Macro Data |
| smc | Yaskawa YTerm Data |
| smd | Sega Genesis ROM |
| smd | SmartWare II Data |
| smd | Valve Studiomdl Data |
| smdh | Nintendo 3DS Homebrew Application Data |
| smdx | SunSpec Model Definition XML Data |
| sme | SmartEncryptor Encrypted File |
| smf | 3ds Max Character Studio Shared Motion Flow Data |
| smf | Lowrance StructureMap File |
| smf | QSlim 3D Model |
| smf | Serif PagePlus Metafile |
| smf | SkinMagic Toolkit Data |
| smf | SmartCAM Manufacture File |
| smfx | Fusion Pro Temporary Database |
