| 111. | .doo | Music (Vibrants) |
| 112. | .dos | DOS related file (Win95) ◊ External command file (1st Reader) |
| 113. | .dot | Document template (Microsoft Word) ◊ Line-type definition file (CorelDraw) |
| 114. | .dox | Text document (MultiMate 4.0 - Microsoft Word) ◊ User document binary form (Visual Basic) |
| 115. | .doz | Description Out of Zip (VENDINFO) |
| 116. | .dp | Calendar file (Daily Planner) ◊ Data file (DataPhile) ◊ Primary data file (THOR database) |
| 117. | .dpd | Dyadic predicates (ABC programming language) |
| 118. | .dpg | Mathematical graph (DPGraph) |
| 119. | .dpgraph | Mathematical graph (DPGraph) |
| 120. | .dpj | DeskProto project file (DeskProto CAM) ◊ Project (Borland Delphi) |
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