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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .CAT | Microsoft Corporation | Database Files | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CDB | Nokia | Database Files | Symbian Phonebook Database | Nokia PC Suite | Nokia |
| .CEP | Nomitech | Database Files | CostOS Estimating Project Database File | CostOS Estimating | Nomitech |
| .CKA | Comfort Software Group | Database Files | Comfort Keys Database | Comfort Keys | Comfort Software Group |
| .CKP | Microsoft Corporation | Database Files | SQL Server Checkpoint File | Microsoft SQL Server | Microsoft Corporation |
| .CLF | Ilium Software, Inc. | Database Files | ListPro Database | ListPro | Ilium Software, Inc. |
| .CMD | Microsoft Corporation | Database Files | Windows Command File | Microsoft Notepad | Microsoft Corporation |
| .CND | Melco | Database Files | Melco Condensed Embroidery File | Dakota AlphaSizer | Dakota Collectibles |
| .CRB | BigOven.com | Database Files | BigOven Recipe Database | BigOven Recipe Software | Lakefront Software, LLC |
| .CRP | dBase, LLC | Database Files | dBASE IV Encrypted Database | dBase | dBase, LLC |
| .CRYPT | WhatsApp Inc | Database Files | WhatsApp Encrypted Database File | WhatsApp Inc | |
| .CRYPT12 | WhatsApp Inc | Database Files | WhatsApp Encrypted Database File | WhatsApp Inc | |
| .CRYPT8 | WhatsApp Inc | Database Files | WhatsApp Encrypted Database File | WhatsApp Inc | |
| .CVB | Borland | Database Files | Borland Database Engine | Borland C++ | Micro Focus International plc |
| .CYS | Hot Neuron | Database Files | Clustify Summary Statistics File | Clustify | Hot Neuron |
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