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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .G | Open Source | CAD Files | BRL-CAD Geometry File | BRL-CAD | Open Source |
| .G01 | U.S. Army Corps of Engineers | CAD Files | HEC-RAS Geometry File | HEC-RAS | U.S. Army Corps of Engineers |
| .G09 | Atari Corporation | CAD Files | Atari Picture Image File | Recoil | Piotr Fusik |
| .G3D | GOM & Company | CAD Files | GOM 3D File | GOM Inspect | GOM & Company |
| .GBP | Genie | CAD Files | Genie Timeline Backup Index File | Genie Timeline | Genie |
| .GBX | Nadeo | CAD Files | Nadeo Game File | TrackMania | Nadeo |
| .GCD | General CADD Products | CAD Files | Generic CADD Drawing File | General CADD Pro | General CADD Products |
| .GDS | Cadence Design Systems | CAD Files | Graphic Data System File | Juspertor LayoutEditor | Juspertor |
| .GEO | Redway3d and others | CAD Files | VRML Geography File | TurboCAD | IMSI/Design, LLC |
| .GERBER | Numerical Innovations | CAD Files | Printed Circuit Board Photoplotter Data | ACE 3000 | Numerical Innovations |
| .GG | CAD Files | Google Desktop Gadget File | Google Desktop | ||
| .GHX | Scott Davidson | CAD Files | Grasshopper File | Grasshopper | Scott Davidson |
| .GM1 | New World Computing | CAD Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GPT | Gerber Technology | CAD Files | Gerber Top Pad Master Data | Altium Designer | Altium |
| .GXA | General CADD Products | CAD Files | General CADD Attribute Data | General CADD Pro | General CADD Products |
| .GXC | General CADD Products | CAD Files | General CADD Pro Component | General CADD Pro | General CADD Products |
| .GXD | General CADD Products | CAD Files | General CADD Pro Drawing | General CADD Pro | General CADD Products |
| .GXM | General CADD Products | CAD Files | General CADD Pro Macro File | General CADD Pro | General CADD Products |
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