| 51. | .ddi | Disk image (DiskDupe) |
| 52. | .ddif | Bitmap graphics (DEC DDIF file) |
| 53. | .ddp | Device Driver Profile file (OS/2) |
| 54. | .deb | Debug script (DOS Debug) |
| 55. | .dec | Decoded file ◊ Document (DEC DX, WPS Plus) ◊ UNIX hyperhelp supporting file (ArcView) |
| 56. | .def | Assembly header file (Geoworks Esp) ◊ Data (SmartWare II) ◊ Defaults - definitions ◊ Linker definition file (TLink - WLink...) |
| 57. | .defi | De-install script (Oracle 7) |
| 58. | .dei | Design Engineered Interface (GSI Gerber Systems Inc.) |
| 59. | .dem | A file with USGS standards for Digital Elevation Models (Vista Pro) ◊ Demo ◊ Digital Elevation Model file (ArcView) ◊ Graphics (VistaPro) |
| 60. | .dep | Dependency file (Visual Basic Setup Wizard) |
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