| Extension | File Description |
| .SPDESIGNNO | Uncommon Files |
| .SPDESIGNOP | Uncommon Files |
| .SPDESIGNPI | Uncommon Files |
| .SPDESIGNRE | Uncommon Files |
| .SPDESIGNSI | Uncommon Files |
| .SPDESIGNSK | Uncommon Files |
| .SPDESIGNSU | Uncommon Files |
| .SPDESIGNTH | Uncommon Files |
| .SPDESIGNTX | Uncommon Files |
| .SPDESIGNUN | Uncommon Files |
| .SPDESIGNWE | Uncommon Files |
| .SPDESIGNWF | Uncommon Files |
| .SPDESIGNXM | Uncommon Files |
| .SPDESIGNXO | Uncommon Files |
| .SPDESIGNXS | Uncommon Files |
| .SPDESIGNXS | Uncommon Files |
| .SPDF | Encoded Files |
| .SPE | Plugin Files |
| .SPEC | Developer Files |
| .SPECS | Uncommon Files |
| .SPEED | Uncommon Files |
| .SPEF | Uncommon Files |
| .SPELL | Uncommon Files |
| .SPELLING | Uncommon Files |
| .SPF | Settings Files |
| .SPFX | Settings Files |
| .SPG | Backup Files |
| .SPH | Audio Files |
| .SPHELP | Uncommon Files |
| .SPHERES | Uncommon Files |
| .SPHH | Uncommon Files |
| .SPHP | Uncommon Files |
| .SPI | Backup Files |
| .SPIDERSOLI | Game Files |
| .SPIEL | Uncommon Files |
| .SPIFF | Raster Image Files |
| .SPINES | Uncommon Files |
| .SPJ | Raster Image Files |
| .SPK | Misc Files |
| .SPL | Video Files |
| .SPLIT | Uncommon Files |
| .SPLITTER | Uncommon Files |
| .SPM | Uncommon Files |
| .SPN | Uncommon Files |
| .SPNG | Uncommon Files |
| .SPO | Game Files |
| .SPOO | Uncommon Files |
| .SPOP | Uncommon Files |
| .SPOT | Uncommon Files |
| .SPP | Raster Image Files |
| .SPPACK | Audio Files |
| .SPPT | Uncommon Files |
| .SPQ | Uncommon Files |
| .SPQ?? | Uncommon Files |
| .SPR | Executable Files |
| .SPRE | Uncommon Files |
| .SPRED | Uncommon Files |
| .SPRITE | Raster Image Files |
| .SPRITES | Uncommon Files |
| .SPS | Backup Files |
| .SPT | Data Files |
| .SPTOOLS | Uncommon Files |
| .SPU | Raster Image Files |
| .SPU?? | Uncommon Files |
| .SPV | Data Files |
| .SPW | Uncommon Files |
| .SPWB | Uncommon Files |
| .SPX | Audio Files |
| .SPY | Uncommon Files |
| .SPYX | Uncommon Files |
| .SPZ | Uncommon Files |
| .SQ | Data Files |
| .SQ0 | Uncommon Files |
| .SQ1 | Uncommon Files |
| .SQ2 | Uncommon Files |
| Extension | File Description |
| .SQ3 | Uncommon Files |
| .SQ4 | Uncommon Files |
| .SQ5 | Uncommon Files |
| .SQ6 | Uncommon Files |
| .SQ7 | Uncommon Files |
| .SQ8 | Uncommon Files |
| .SQ9 | Uncommon Files |
| .SQA | Uncommon Files |
| .SQB | Backup Files |
| .SQC | Uncommon Files |
| .SQD | Data Files |
| .SQDB | Uncommon Files |
| .SQE | Uncommon Files |
| .SQEXP | Uncommon Files |
| .SQF | Data Files |
| .SQG | Uncommon Files |
| .SQH | Uncommon Files |
| .SQI | Uncommon Files |
| .SQJ | Uncommon Files |
| .SQK | Uncommon Files |
| .SQL | Database Files |
| .SQM | Game Files |
| .sqml | Uncommon Files |
| .SQN | Uncommon Files |
| .SQN?? | Uncommon Files |
| .SQO | Uncommon Files |
| .SQP | Uncommon Files |
| .SQQ | Uncommon Files |
| .SQR | Data Files |
| .SQS | Uncommon Files |
| .SQT | Uncommon Files |
| .SQU | Uncommon Files |
| .SQV | Uncommon Files |
| .SQW | Uncommon Files |
| .SQX | Compressed Files |
| .SQY | Uncommon Files |
| .SQZ | Video Files |
| .SR | Raster Image Files |
| .SR0 | Uncommon Files |
| .SR1 | Uncommon Files |
| .SR2 | Raster Image Files |
| .SR3 | Uncommon Files |
| .SR4 | Uncommon Files |
| .SR5 | Uncommon Files |
| .SR6 | Uncommon Files |
| .SR7 | Uncommon Files |
| .SR8 | Uncommon Files |
| .SR9 | Uncommon Files |
| .SRA | Uncommon Files |
| .SRB | Uncommon Files |
| .SRC | Developer Files |
| .SRD | Uncommon Files |
| .SRE | Uncommon Files |
| .SREC | Uncommon Files |
| .SRF | 3D Image Files |
| .SRFMAP | Uncommon Files |
| .SRG | Uncommon Files |
| .SRH | Uncommon Files |
| .SRI | Uncommon Files |
| .SRJ | Uncommon Files |
| .SRK | Uncommon Files |
| .SRL | Uncommon Files |
| .SRM | Game Files |
| .SRN | Uncommon Files |
| .SRO | Uncommon Files |
| .SRP | Uncommon Files |
| .SRPM | Uncommon Files |
| .SRQ | Uncommon Files |
| .SRQ?? | Uncommon Files |
| .SRR | Backup Files |
| .SRS | Settings Files |
| .SRT | Video Files |
| .SRU | Uncommon Files |
| .SRV | Uncommon Files |
| .SRVC | Uncommon Files |
