| Extension | File Description |
| .IP2 | Uncommon Files |
| .IP3 | Uncommon Files |
| .IP4 | Uncommon Files |
| .IP5 | Uncommon Files |
| .IP6 | Uncommon Files |
| .IP7 | Uncommon Files |
| .IP8 | Uncommon Files |
| .IP9 | Uncommon Files |
| .IPA | Executable Files |
| .IPB | Uncommon Files |
| .IPC | Uncommon Files |
| .IPCC | Uncommon Files |
| .IPD | Backup Files |
| .IPE | Uncommon Files |
| .IPF | Text Files |
| .IPFG | Uncommon Files |
| .IPFG 2.4 | Uncommon Files |
| .IPFIX | Data Files |
| .IPG | Compressed Files |
| .IPH | Uncommon Files |
| .IPI | Uncommon Files |
| .IPJ | CAD Files |
| .IPK | Compressed Files |
| .IPKG | Data Files |
| .IPL | Game Files |
| .IPL22 | Uncommon Files |
| .IPLI | Uncommon Files |
| .IPM | Uncommon Files |
| .IPN | CAD Files |
| .IPO | Uncommon Files |
| .IPOD | System Files |
| .IPP | Developer Files |
| .IPQ | Uncommon Files |
| .IPR | Developer Files |
| .IPS | Game Files |
| .IPSW | Misc Files |
| .IPT | CAD Files |
| .IPTC | Uncommon Files |
| .IPTHEME | Settings Files |
| .IPU | Uncommon Files |
| .IPV | Uncommon Files |
| .IPW | Uncommon Files |
| .IPX | Raster Image Files |
| .IPY | Uncommon Files |
| .IPZ | Uncommon Files |
| .IQ | Uncommon Files |
| .IQ0 | Uncommon Files |
| .IQ1 | Uncommon Files |
| .IQ2 | Uncommon Files |
| .IQ3 | Uncommon Files |
| .IQ4 | Uncommon Files |
| .IQ5 | Uncommon Files |
| .IQ6 | Uncommon Files |
| .IQ7 | Uncommon Files |
| .IQ8 | Uncommon Files |
| .IQ9 | Uncommon Files |
| .IQA | Uncommon Files |
| .IQB | Uncommon Files |
| .IQC | Uncommon Files |
| .IQD | Uncommon Files |
| .IQE | Uncommon Files |
| .IQF | Uncommon Files |
| .IQG | Uncommon Files |
| .IQH | Uncommon Files |
| .IQI | Uncommon Files |
| .IQJ | Uncommon Files |
| .IQK | Uncommon Files |
| .IQL | Uncommon Files |
| .IQM | Uncommon Files |
| .IQN | Uncommon Files |
| .IQO | Uncommon Files |
| .IQP | Uncommon Files |
| .IQQ | Uncommon Files |
| .IQR | Uncommon Files |
| .IQS | Uncommon Files |
| Extension | File Description |
| .IQT | Uncommon Files |
| .IQU | Uncommon Files |
| .IQV | Uncommon Files |
| .IQW | Uncommon Files |
| .IQX | Uncommon Files |
| .IQY | Web Files |
| .IQZ | Uncommon Files |
| .IR | Uncommon Files |
| .IR0 | Uncommon Files |
| .IR1 | Uncommon Files |
| .IR2 | Uncommon Files |
| .IR3 | Uncommon Files |
| .IR4 | Uncommon Files |
| .IR5 | Uncommon Files |
| .IR6 | Uncommon Files |
| .IR7 | Uncommon Files |
| .IR8 | Uncommon Files |
| .IR9 | Uncommon Files |
| .IRA | Uncommon Files |
| .IRB | Uncommon Files |
| .IRC | Uncommon Files |
| .IRCD | Uncommon Files |
| .IRD | Uncommon Files |
| .IRE | Uncommon Files |
| .IRF | Video Files |
| .IRG | Uncommon Files |
| .IRH | Uncommon Files |
| .IRI | Uncommon Files |
| .IRIS | Uncommon Files |
| .IRIX | Uncommon Files |
| .IRIX6 | Uncommon Files |
| .IRIX64BIT | Uncommon Files |
| .IRJ | Uncommon Files |
| .IRK | Uncommon Files |
| .IRL | Uncommon Files |
| .IRM | Misc Files |
| .IRN | Uncommon Files |
| .IRO | Uncommon Files |
| .IROCK | Data Files |
| .IRP | Data Files |
| .IRQ | Uncommon Files |
| .IRR | Uncommon Files |
| .IRS | Settings Files |
| .IRT | Uncommon Files |
| .IRTP | Uncommon Files |
| .IRU | Uncommon Files |
| .IRV | Uncommon Files |
| .IRW | Uncommon Files |
| .IRX | Data Files |
| .IRY | Uncommon Files |
| .IRZ | Uncommon Files |
| .IS | Uncommon Files |
| .IS0 | Uncommon Files |
| .IS1 | Uncommon Files |
| .IS2 | Uncommon Files |
| .IS3 | Uncommon Files |
| .IS4 | Uncommon Files |
| .IS5 | Uncommon Files |
| .IS6 | Uncommon Files |
| .IS7 | Uncommon Files |
| .IS8 | Uncommon Files |
| .IS9 | Uncommon Files |
| .IS? | Data Files |
| .ISA | Uncommon Files |
| .ISB | Uncommon Files |
| .ISBN | Uncommon Files |
| .ISC | Developer Files |
| .ISD | Page Layout Files |
| .ISE | Uncommon Files |
| .ISF | Data Files |
| .ISFF | Uncommon Files |
| .ISG | Uncommon Files |
| .ISH | Compressed Files |
| .ISI | Uncommon Files |
| .ISJ | Uncommon Files |
