| cap | Pasco Capstone Experiment Data |
| cap | Shomiti Surveyor Captured Data |
| cap | Snoop Captured Data |
| caps | CaptureSaver Knowledge Base |
| capt | Linrock Capito Data |
| car | DAZ 3D Carrara 6 Environment Data |
| car | PC 1000 Calculation Result Data |
| caro | Adobe Acrobat Creator Code |
| cas | ANSYS Fluent Case Data |
| cas | Autodesk Cascade License Data |
| cas | Bitdefender CAS Data |
| cas4 | Cascade DTP v4 Layout |
| cascii | CACTVS Chemical ASCII Format Data |
| case | ANSYS EnSight Results Data |
| cast | Asciinema Asciicast Terminal Recording Data |
| castep | CASTEP Data |
| cat | Advanced Disk Catalog Database |
| cat | ArcSoft PhotoStudio CAT Data |
| cat | CircuitCAM Design Template |
| cat | Concordance Database Concatenation Data |
| cat | dBase IV Catalog Backup |
| cat | ESO-MIDAS Catalog Data |
| cat | IBM Cognos Impromptu Database Report |
| cat | IBM Rational Rose Logical Package |
| cat | Quicken IntelliCharge Categorization |
| cat | TINA Pro Catalog |
| cat4d | Maxon Cinema 4D Catalog |
| catalog | Catia Catalog |
| catanalysis | CATIA Analysis Data |
| catcatalog | CATIA Catalog Data |
| catfct | CATIA CATfct Data |
| catknowledge | CATIA CATKnowledge Data |
| catmaterial | CATIA CATMaterial Data |
| catnls | CATIA NLS Data |
| catom | Chief Architect Catalogue Data |
