| hyb | HYB Hybrid Data |
| hyc | Corel WordPerfect Internal Data |
| hyd | MARIN Hydrodynamic Database File |
| hyp | HyperLynx BoardSim PCB Layout |
| hyq | CARE-S Depth Hydrographs for Gauged Pipes |
| hyv | Team Manager 1 Meet Setup File |
| hzd | SeisWorks Horizon Datafile |
| hzf | Neosat Fixes |
| hzn | Observer Pro Horizon Data |
| i2g | Intergeo I2G Geometric File |
| i3dm | Cesium Instanced 3D Tiles Data |
| i3ml | I3ML Data |
| i5d | IUCLID5 XML Backup |
| i5z | IUCLID5 Export File |
| ia6 | IApproach Work Data |
| iab | DB/TextWorks Image Annotation List Backup |
| iab | Iomega Automatic Backup Data |
| iad | Symantec Patch Management Solution Data |
| iadpage | iAd Producer Page Template |
| iak | Mail.dat Information Access Key |
| ias | Intermodulation Analysis System Data |
| iati | International Aid Transparency Initiative Data |
| iaw | ImageAMMO Wrapper |
| ibak | Password Safe Intermediate Backup Archive |
| ibd | Symantec Patch Management Solution v7 Data |
| ibd | MySQL InnoDB Tablespace |
| ibe | IBECrypto Encrypted File |
| ibk | Treepad Database Index Backup |
| ibl | sIBL System Data |
| ibn | WinIQSIM Data |
| ibo | IB Objects Data |
| ibs | IBIS Data |
| ibt | IGOR Pro Binary Misc File |
| ibv | IGOR Pro Binary Variable File |
| ibw | IGOR Pro Binary Wave File |
