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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .C18 | Dassault Systèmes | CAD Files | Dassault Systemes Catia V4 Sequential File | Dassault Systemes CATIA | Dassault Systèmes |
| .CAE | Dassault Systèmes | CAD Files | Abaqus CAE Model File | Abaqus/Standard | Dassault Systèmes |
| .CATALOG | Dassault Systèmes | CAD Files | CATIA Catalog File | CATIA | Dassault Systèmes |
| .CATDRAWING | Dassault Systèmes | CAD Files | CATIA V5 Drawing | Dassault Systemes CATIA | Dassault Systèmes |
| .CATFCT | Dassault Systèmes | CAD Files | CATIA CATfct Data File | CATIA | Dassault Systèmes |
| .CATMATERIAL | Dassault Systèmes | CAD Files | CATIA CATMaterial Data | CATIA | Dassault Systèmes |
| .CATPART | Dassault Systèmes | CAD Files | CATIA V5 Part File | CATIA | Dassault Systèmes |
| .CATPRODUCT | Dassault Systèmes | CAD Files | CATIA V5 Assembly File | Dassault Systemes CATIA | Dassault Systèmes |
| .CDD | CS Odessa | Vector Image Files | ConceptDraw PRO Document | CADAM | Dassault Systèmes |
| .CEX | Dassault Systèmes | Settings Files | SolidWorks Enterprise PDM Vault Export File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .CGR | Dassault Systèmes | CAD Files | CATIA Graphical Representation File | CATIA | Dassault Systèmes |
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