| Extension | File Description |
| .INP | Data Files |
| .IP | Data Files |
| .IPFIX | Data Files |
| .IPKG | Data Files |
| .IROCK | Data Files |
| .IRP | Data Files |
| .IRX | Data Files |
| .IS? | Data Files |
| .ISF | Data Files |
| .IST | Data Files |
| .ITE | Data Files |
| .ITL | Data Files |
| .ITM | Data Files |
| .ITX | Data Files |
| .IVC | Data Files |
| .IVD | Data Files |
| .IW | Data Files |
| .IX2 | Data Files |
| .IXB | Data Files |
| .JBI | Data Files |
| .JDB | Data Files |
| .JEF | Data Files |
| .JLT | Data Files |
| .JMP | Data Files |
| .JNT | Data Files |
| .JOBOPTIONS | Data Files |
| .JODA | Data Files |
| .JOINED | Data Files |
| .JPH | Data Files |
| .JRXML | Data Files |
| .JSONML | Data Files |
| .KAP | Data Files |
| .KARBON | Data Files |
| .KATE | Data Files |
| .KBS | Data Files |
| .KDBX | Data Files |
| .KDC | Data Files |
| .KFO | Data Files |
| .KIA | Data Files |
| .KID | Data Files |
| .KMY | Data Files |
| .KNO | Data Files |
| .KNP | Data Files |
| .KPF | Data Files |
| .KPP | Data Files |
| .KPR | Data Files |
| .KPX | Data Files |
| .KPXX | Data Files |
| .KTH | Data Files |
| .L16 | Data Files |
| .L6T | Data Files |
| .LACCDB | Data Files |
| .LAS | Data Files |
| .LASXML | Data Files |
| .LBX | Data Files |
| .LCD | Data Files |
| .LCM | Data Files |
| .LD2 | Data Files |
| .LDF | Data Files |
| .LDIF | Data Files |
| .LEX | Data Files |
| .LFP | Data Files |
| .LGF | Data Files |
| .LGH | Data Files |
| .LGI | Data Files |
| .LIB | Data Files |
| .LIF | Data Files |
| .LIFE | Data Files |
| .LIVEREG | Data Files |
| .LIVEUPDATE | Data Files |
| .LIX | Data Files |
| .LLB | Data Files |
| .LMS | Data Files |
| .LMX | Data Files |
| .LNG | Data Files |
| Extension | File Description |
| .LOC | Data Files |
| .LOSTXML | Data Files |
| .LP7 | Data Files |
| .LPP | Data Files |
| .LRF | Data Files |
| .LRS | Data Files |
| .LRX | Data Files |
| .LSL | Data Files |
| .LSP | Data Files |
| .LSR | Data Files |
| .LST | Data Files |
| .LVM | Data Files |
| .LVW | Data Files |
| .LW4 | Data Files |
| .LY | Data Files |
| .MADS | Data Files |
| .MAI | Data Files |
| .MBD | Data Files |
| .MBG | Data Files |
| .MBL | Data Files |
| .MBP | Data Files |
| .MBX | Data Files |
| .MC1 | Data Files |
| .MCD | Data Files |
| .MD8 | Data Files |
| .MDZ | Data Files |
| .MEG | Data Files |
| .MET | Data Files |
| .METS | Data Files |
| .MEX | Data Files |
| .MFL | Data Files |
| .MFT | Data Files |
| .MHP | Data Files |
| .MIE | Data Files |
| .MLB | Data Files |
| .MMA | Data Files |
| .MMAP | Data Files |
| .MMC | Data Files |
| .MML | Data Files |
| .MMP | Data Files |
| .MMW | Data Files |
| .MNO | Data Files |
| .MNY | Data Files |
| .MOBI | Data Files |
| .MOHO | Data Files |
| .MOL | Data Files |
| .MONEY | Data Files |
| .MOX | Data Files |
| .MPD | Data Files |
| .MPI | Data Files |
| .MPJ | Data Files |
| .MPP | Data Files |
| .MPR | Data Files |
| .MPS | Data Files |
| .MPT | Data Files |
| .MPX | Data Files |
| .MPZ | Data Files |
| .MQ4 | Data Files |
| .MQY | Data Files |
| .MRCX | Data Files |
| .MS8 | Data Files |
| .MSEED | Data Files |
| .MSEQ | Data Files |
| .MSIF | Data Files |
| .MSTY | Data Files |
| .MTH | Data Files |
| .MTT | Data Files |
| .MTW | Data Files |
| .MUF | Data Files |
| .MUP | Data Files |
| .MUSICXML | Data Files |
| .MW | Data Files |
| .MWC | Data Files |
| .MWF | Data Files |
| .MX | Data Files |
