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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .CKT | Altium | Data Files | CircuitMaker File | Altium Designer | Altium |
| .CPA | Zuken | CAD Files | CADSTAR PCB Archive File | Altium Designer | Altium |
| .DEI | Open Source | Data Files | Gerber Design Engineered Interface | Altium Designer | Altium |
| .DRL | Gerber Technology | Data Files | Gerber Drill Rack File | Altium Designer | Altium |
| .ELK | Altium | Developer Files | Altium Designer Linker Error Message | Altium Designer | Altium |
| .EQN | Altium | CAD Files | GAL Equation File | Altium Designer | Altium |
| .GAL | Molecular Devices | Data Files | GenePix Array List | Altium Designer | Altium |
| .GBL | Ucamco | Data Files | Gerber Bottom Layer Data File | Altium Designer | Altium |
| .GBP | Genie | Backup Files | Genie Timeline Backup Index File | Altium Designer | Altium |
| .GBR | Gerber Technology | Data Files | Gerber Format File | Altium Designer | Altium |
| .GDD | Altium | 3D Image Files | Gerber Drill Drawing Data | Altium Designer | Altium |
| .GM1 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Altium Designer | Altium |
| .GML | Galdos Systems, Inc. | GIS Files | Geography Markup Language File | Altium Designer | Altium |
| .GP3 | Arobas Music | Data Files | Guitar Pro 3 File | Altium Designer | Altium |
| .GPI | Garmin | Data Files | Garmin Point Of Interest File | Altium Designer | Altium |
| .GPT | Gerber Technology | CAD Files | Gerber Top Pad Master Data | Altium Designer | Altium |
| .GTO | Quicken | Data Files | Quicken Online Data File | Altium Designer | Altium |
| .GTP | Ucamco | Data Files | Gerber Top Solder Paste Data File | Altium Designer | Altium |
| .GTS | Ucamco | Data Files | Gerber Top Solder Mask Data File | Altium Designer | Altium |
| .PCB | Autodesk, Inc. | Data Files | Printed Circuit Board Design File | Altium Designer | Altium |
| .PCBDOC | Altium | Data Files | Printed Circuit Board Description | Altium Designer | Altium |
| .PHO | Ucamco | CAD Files | Gerber Photoplot File | Altium Designer | Altium |
| .PLB | Microsoft Corporation | Data Files | Microsoft Robotics Developer Studio Playback Data | Altium Designer | Altium |
| .PRJPCB | Altium | 3D Image Files | Altium Designer Project File | Altium Designer | Altium |
| .ROU | Gerber Technology | Data Files | Gerber Route File | Altium Designer | Altium |
| .RUL | Flexera Software | Developer Files | InstallShield Rules File | Altium Designer | Altium |
| .SCHDOC | Altium | Uncommon Files | Altium Designer File | Altium Designer | Altium |
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