| Extension | File Description |
| .SJS | Uncommon Files |
| .SJT | Uncommon Files |
| .SJU | Uncommon Files |
| .SJV | Uncommon Files |
| .SJW | Uncommon Files |
| .SJX | Uncommon Files |
| .SJY | Uncommon Files |
| .SJZ | Uncommon Files |
| .SJ_ | Uncommon Files |
| .SK0 | Uncommon Files |
| .SK1 | Uncommon Files |
| .SK2 | Uncommon Files |
| .SK3 | Uncommon Files |
| .SK4 | Uncommon Files |
| .SK5 | Uncommon Files |
| .SK6 | Uncommon Files |
| .SK7 | Uncommon Files |
| .SK8 | Uncommon Files |
| .SK9 | Uncommon Files |
| .SKA | Uncommon Files |
| .SKCARD | Uncommon Files |
| .SKD | Uncommon Files |
| .SKE | Uncommon Files |
| .SKELETON | Uncommon Files |
| .SKG | Uncommon Files |
| .SKH | Uncommon Files |
| .SKJ | Uncommon Files |
| .SKK | Uncommon Files |
| .SKNPRJ | Uncommon Files |
| .SKO | Uncommon Files |
| .SKQ | Uncommon Files |
| .SKS | Uncommon Files |
| .SKT | Uncommon Files |
| .SKU | Uncommon Files |
| .SKW | Uncommon Files |
| .SKWRITE | Uncommon Files |
| .SKY | Uncommon Files |
| .SK_ | Uncommon Files |
| .SL0 | Uncommon Files |
| .SL1 | Uncommon Files |
| .SL2 | Uncommon Files |
| .SL3 | Uncommon Files |
| .SL4 | Uncommon Files |
| .SL5 | Uncommon Files |
| .SL6 | Uncommon Files |
| .SL7 | Uncommon Files |
| .SL8 | Uncommon Files |
| .SL9 | Uncommon Files |
| .SLABFACE | Uncommon Files |
| .SLAP | Uncommon Files |
| .SLASHER | Uncommon Files |
| .SLASHER2 | Uncommon Files |
| .SLC | Uncommon Files |
| .SLDLFP | Uncommon Files |
| .SLEIGH | Uncommon Files |
| .SLG | Uncommon Files |
| .SLH | Uncommon Files |
| .SLI | Uncommon Files |
| .SLICKEDIT | Uncommon Files |
| .SLIP | Uncommon Files |
| .SLJ | Uncommon Files |
| .SLL1 | Uncommon Files |
| .SLL7 | Uncommon Files |
| .SLM | Uncommon Files |
| .SLO | Uncommon Files |
| .SLOW | Uncommon Files |
| .SLQ | Uncommon Files |
| .SLR | Uncommon Files |
| .SLS | Uncommon Files |
| .SLST | Uncommon Files |
| .SLSTL | Uncommon Files |
| .SLTNG | Uncommon Files |
| .SLU | Uncommon Files |
| .SLV | Uncommon Files |
| .SLW | Uncommon Files |
| Extension | File Description |
| .SLX | Uncommon Files |
| .SLY | Uncommon Files |
| .SLZ | Uncommon Files |
| .SM$ | Uncommon Files |
| .SM+ | Uncommon Files |
| .SM0 | Uncommon Files |
| .SM1 | Uncommon Files |
| .SM2 | Uncommon Files |
| .SM3 | Uncommon Files |
| .SM4 | Uncommon Files |
| .SM5 | Uncommon Files |
| .SM6 | Uncommon Files |
| .SM7 | Uncommon Files |
| .SM8 | Uncommon Files |
| .SM9 | Uncommon Files |
| .SMAF | Uncommon Files |
| .SMALL | Uncommon Files |
| .SMALLER | Uncommon Files |
| .SMART1 | Uncommon Files |
| .SMART2 | Uncommon Files |
| .SMART3 | Uncommon Files |
| .SMART4 | Uncommon Files |
| .SMARTDEBUG | Uncommon Files |
| .SMARTDTS | Uncommon Files |
| .SMARTGSOS | Uncommon Files |
| .SMARTHCGS | Uncommon Files |
| .SMARTMATH | Uncommon Files |
| .SMARTMISC | Uncommon Files |
| .SMARTPORT | Uncommon Files |
| .SMARTRECS | Uncommon Files |
| .SMARTSANE | Uncommon Files |
| .SMARTSPEEC | Uncommon Files |
| .SMARTSTACK | Uncommon Files |
| .SMB | Uncommon Files |
| .SMCL | Uncommon Files |
| .SMDF | Uncommon Files |
| .SMDL | Uncommon Files |
| .SME | Uncommon Files |
| .SMFX | Uncommon Files |
| .SMG | Uncommon Files |
| .SMH | Uncommon Files |
| .SMHT | Uncommon Files |
| .SMITH | Uncommon Files |
| .SMJ | Uncommon Files |
| .SML1 | Uncommon Files |
| .SML2 | Uncommon Files |
| .SML3 | Uncommon Files |
| .SMLICENSE | Uncommon Files |
| .SMN | Uncommon Files |
| .SMO | Uncommon Files |
| .SMOOTH | Uncommon Files |
| .SMOV | Uncommon Files |
| .SMP3 | Uncommon Files |
| .SMPEG | Uncommon Files |
| .SMPG | Uncommon Files |
| .SMQ | Uncommon Files |
| .SMQ?? | Uncommon Files |
| .SMR | Uncommon Files |
| .SMU | Uncommon Files |
| .SMW | Uncommon Files |
| .SMX | Uncommon Files |
| .SMY | Uncommon Files |
| .SMZ | Uncommon Files |
| .SM_ | Uncommon Files |
| .SN | Uncommon Files |
| .SN0 | Uncommon Files |
| .SN3 | Uncommon Files |
| .SN4 | Uncommon Files |
| .SN5 | Uncommon Files |
| .SN6 | Uncommon Files |
| .SN7 | Uncommon Files |
| .SN8 | Uncommon Files |
| .SN9 | Uncommon Files |
| .SNAKE | Uncommon Files |
| .SNAP | Uncommon Files |
