| sn2 | Drive Snapshot Backup Data |
| sn3 | ChessDB Name Data |
| sn3 | Drive Snapshot Backup Data |
| sn4 | Scid Name Data |
| sn4 | Drive Snapshot Backup Data |
| sn5 | Drive Snapshot Backup Data |
| sn6 | Drive Snapshot Backup Data |
| sn7 | Drive Snapshot Backup Data |
| sn8 | Drive Snapshot Backup Data |
| sn9 | Drive Snapshot Backup Data |
| sna | ZX Spectrum Emulator Snapshot |
| sna | Drive Snapshot Backup Data |
| snag | SnagIt Capture File |
| snagitstamps | SnagIt Stamp Archive |
| snagstyles | SnagIt Style Archive |
| snapshot | VMware ThinApp Snapshot File |
| snb | S-Note Data |
| snbkp | S Memo Backup |
| sne | Spectronaut Experiments Data |
| snes | SNES ROM Image |
| snf | Starry Night Data |
| snip | Microsoft Windows Snipping Tool Snip Data |
| snl | EGrid32 Form Snippet |
| snm | Netscape Mail Index |
| snn | STATISTICA v7 Neural Networks File |
| snoop | Snoop Verbose Trace File |
| snp | GenePattern SNP Data |
| snp | Oracle Database Snapshot |
| snr | Mail.dat Seed Name File |
| sns | Save-N-Sync Profile |
| snx | ZX Spectrum Emulator Snapshot Extended |
| soa | Sage MAS 90 Data |
| sod | BiRT Spreadsheet Object Design File |
| sof | Altera SRAM Object File |
| soft | Autodesk Maya FCheck Tool Data |