| seman | Xtext Semantics Data |
| semi | Spartan Semi-Empirical Data |
| sems | EcoStruxure Machine Expert SEMS Data |
| semul | WinZip Registration Data |
| senl | SAP Enable Now App Launcher |
| sense | LX-SenseAnnotator Sense Data |
| seo | SEO Note |
| seospider | Screaming Frog SEO Spider Data |
| sep | SEEP/W Data |
| sep | SimEnhancer Profile |
| sep | SWAT Septic Input Data |
| seq | CYANA Sequence File |
| seq | SAM sampleseqs Sequence Data |
| seq | Tinker Sequence |
| seq | Workswell Recorded Thermal Sequence |
| seq | XtalView Xfit Sequence Data |
| seqbac | SEQ Backup Data |
| ser | Noptel NOS Statistics Series Data |
| server | Bonobo Activation API Data |
| serverdef | Eclipse WTP Server Definition Data |
| ses | Adobe Audition v2 Session |
| ses | DynaComm Terminal Session Data |
| ses | Hummingbird Exceed X-Session Data |
| ses | MSC Patran Session Data |
| ses | SciTE Session Data |
| ses | SPECCTRA Session File |
| ses | Zemax Session Data |
| sess | PHP Session Data |
| session | Mozilla Firefox Session Data |
| sesx | Adobe Audition Session |
