| Extension | File Description |
| .ILF | Uncommon Files |
| .ILG | Uncommon Files |
| .ILH | Uncommon Files |
| .ILHT | Uncommon Files |
| .ILI | Uncommon Files |
| .ILJ | Uncommon Files |
| .ILL | Uncommon Files |
| .ILM | Uncommon Files |
| .ILN | Uncommon Files |
| .ILO | Uncommon Files |
| .ILP | Uncommon Files |
| .ILPLOPTION | Uncommon Files |
| .ILPLVOUCHE | Uncommon Files |
| .ILQ | Uncommon Files |
| .ILR | Uncommon Files |
| .ILS | Uncommon Files |
| .ILSR | Uncommon Files |
| .ILT | Uncommon Files |
| .ILU | Uncommon Files |
| .ILV | Uncommon Files |
| .ILVG | Uncommon Files |
| .ILW | Uncommon Files |
| .ILX | Uncommon Files |
| .ILY | Uncommon Files |
| .ILZ | Uncommon Files |
| .IM | Uncommon Files |
| .IM0 | Uncommon Files |
| .IM04 | Uncommon Files |
| .IM1 | Uncommon Files |
| .IM2 | Uncommon Files |
| .IM24 | Uncommon Files |
| .IM3 | Uncommon Files |
| .IM30 | Uncommon Files |
| .IM32 | Uncommon Files |
| .IM4 | Uncommon Files |
| .IM5 | Uncommon Files |
| .IM6 | Uncommon Files |
| .IM7 | Uncommon Files |
| .IM8 | Uncommon Files |
| .IM9 | Uncommon Files |
| .IMA4 | Uncommon Files |
| .IMAGINE | Uncommon Files |
| .IMAKE | Uncommon Files |
| .IMB | Uncommon Files |
| .IMC | Uncommon Files |
| .IME | Uncommon Files |
| .IMELODY | Uncommon Files |
| .IMESHDEF | Uncommon Files |
| .IMGSAO | Uncommon Files |
| .IMH | Uncommon Files |
| .IMK | Uncommon Files |
| .IMM | Uncommon Files |
| .IMN | Uncommon Files |
| .IMO | Uncommon Files |
| .IMPD | Uncommon Files |
| .IMPLEMENT | Uncommon Files |
| .IMQ | Uncommon Files |
| .IMS | Uncommon Files |
| .IMSP | Uncommon Files |
| .IMU | Uncommon Files |
| .IMV | Uncommon Files |
| .IMW | Uncommon Files |
| .IMX | Uncommon Files |
| .IM_ | Uncommon Files |
| .IN$ | Uncommon Files |
| .IN0 | Uncommon Files |
| .IN1 | Uncommon Files |
| .IN2 | Uncommon Files |
| .IN3 | Uncommon Files |
| .IN4 | Uncommon Files |
| .IN5 | Uncommon Files |
| .IN6 | Uncommon Files |
| .IN7 | Uncommon Files |
| .IN8 | Uncommon Files |
| .IN9 | Uncommon Files |
| Extension | File Description |
| .INA | Uncommon Files |
| .INB | Uncommon Files |
| .INCH | Uncommon Files |
| .INDENT | Uncommon Files |
| .INDEX | Uncommon Files |
| .INDIGO | Uncommon Files |
| .INE | Uncommon Files |
| .INF1 | Uncommon Files |
| .INFINI-D | Uncommon Files |
| .INFO1 | Uncommon Files |
| .INFO2 | Uncommon Files |
| .INFO3 | Uncommon Files |
| .INFO4 | Uncommon Files |
| .INGR | Uncommon Files |
| .INH | Uncommon Files |
| .INIT | Uncommon Files |
| .INJ | Uncommon Files |
| .INKBL | Uncommon Files |
| .INKML | Uncommon Files |
| .INLOVE | Uncommon Files |
| .INLX | Uncommon Files |
| .INN | Uncommon Files |
| .INPUT | Uncommon Files |
| .INQ | Uncommon Files |
| .INR | Uncommon Files |
| .INRS | Uncommon Files |
| .INSCRIBE | Uncommon Files |
| .INSID | Uncommon Files |
| .INSPECT | Uncommon Files |
| .INST | Uncommon Files |
| .INST2 | Uncommon Files |
| .INSTALL | Uncommon Files |
| .INSTALLER | Uncommon Files |
| .INSTR | Uncommon Files |
| .INSTRUC | Uncommon Files |
| .INSTRUCT | Uncommon Files |
| .INSURANCE | Uncommon Files |
| .INSURANCE2 | Uncommon Files |
| .INTEGER | Uncommon Files |
| .INTER | Uncommon Files |
| .INTEREST | Uncommon Files |
| .INTERIEUR | Uncommon Files |
| .INTERLEAV | Uncommon Files |
| .INTERLOCKF | Uncommon Files |
| .INTERNETMA | Uncommon Files |
| .INTERRUPT | Uncommon Files |
| .INTKEY | Uncommon Files |
| .INTMATH | Uncommon Files |
| .INTO | Uncommon Files |
| .INTREC | Uncommon Files |
| .INTRO | Uncommon Files |
| .INTRODUCT | Uncommon Files |
| .INTRODUCTI | Uncommon Files |
| .INU | Uncommon Files |
| .INVADERS | Uncommon Files |
| .INVEN | Uncommon Files |
| .INVENTOR | Uncommon Files |
| .INVENTORY | Uncommon Files |
| .INVERT | Uncommon Files |
| .INV_LOWRES | Uncommon Files |
| .INW | Uncommon Files |
| .INY | Uncommon Files |
| .INZ | Uncommon Files |
| .IN_ | Uncommon Files |
| .IO | Uncommon Files |
| .IO0 | Uncommon Files |
| .IO1 | Uncommon Files |
| .IO2 | Uncommon Files |
| .IO3 | Uncommon Files |
| .IO4 | Uncommon Files |
| .IO5 | Uncommon Files |
| .IO6 | Uncommon Files |
| .IO7 | Uncommon Files |
| .IO8 | Uncommon Files |
| .IO9 | Uncommon Files |
