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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .I3C | IBM | Data Files | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .I3I | IBM | Uncommon Files | IBM Voice Type Languages New User File | IBM Voice Type | IBM |
| .IBS | IBM | Data Files | I2 iBase Data File | i2 iBase | IBM |
| .ID | IBM | Uncommon Files | Lotus Notes User ID File | IBM Lotus Notes | IBM |
| .IDC | Pierre-Emmanuel Gougelet | Uncommon Files | Core Software Tech IDC File | IBM Lotus Notes | IBM |
| .IFX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
| .IIB | IBM | 3D Image Files | IBM Lotus Notes Data | IBM Lotus Notes | IBM |
| .IL | Microsoft Corporation | Uncommon Files | MSIL Assembler Input File | Fortran | IBM |
| .ILV | IBM Cognos | Data Files | ILOG File | ILOG CPLEX Optimization Studio | IBM |
| .IMP | Lotus Software | Spreadsheet Files | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .INN | Micro Focus International plc | Uncommon Files | Micro Focus COBOL/2 Overlay File | IBM COBOL | IBM |
| .IRL | IBM | Settings Files | IBM WebSphere ILOG JRules Rule File | IBM WebSphere ILOG JRules | IBM |
| .ITX | IBM | Data Files | ITX Form Template | FileNet eForms | IBM |
| .IXF | IBM | Data Files | Integration Exchange Format File | IBM DB2 | IBM |
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