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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .CAT | Microsoft Corporation | System Files | Windows Catalog File | Rational Rose | IBM |
| .CBL | IBM | Developer Files | COBOL Source Code File | IBM COBOL | IBM |
| .CBX | IBM | Uncommon Files | Rational XDE Collaboration Data File | Rational XDE | IBM |
| .CH1 | IBM | Graphic Files | IBM Freelance Graphics Chart File | Lotus Freelance Graphics | IBM |
| .CIX | IBM | Data Files | Rational XDE | Rational XDE | IBM |
| .CLO | Pierre-Emmanuel Gougelet | Graphic Files | Cloe Ray-Tracer Image | IBM SPSS | IBM |
| .CLX | IBM | Data Files | Rational XDE | Rational XDE | IBM |
| .CMD | Microsoft Corporation | Executable Files | Windows Command File | OS/2 | IBM |
| .CNT | Microsoft Corporation | System Files | Help Contents File | Rational Rose | IBM |
| .CNX | IBM | Data Files | IBM Rational XDE Data | Rational XDE | IBM |
| .COB | IBM | Developer Files | COBOL Source Code File | IBM COBOL | IBM |
| .COL | Open Source | Data Files | Bibexcel File | IBM Lotus Notes | IBM |
| .CPF | IBM | Data Files | Cognos Project File | IBM Cognos Business Intelligence | IBM |
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