| 61. | .sdd | Presentation file (StarOffice StarImpress) |
| 62. | .sdf | Source definition file (Sourcer) ◊ System Data Format file (legacy Unisys (Sperry) fixed length ASCII text format) |
| 63. | .sdi | Software Distribution Network Info file |
| 64. | .sdk | Disk Image (Roland S-550/S-50/W-30) |
| 65. | .sdl | Library (SmartDraw) ◊ Parsys hardware network description file ◊ Scene Description Language (Alias Wavefront) |
| 66. | .sdml | Spacial Data Modeling Language |
| 67. | .sdn | Software Distribution Network compressd file archive (pak251.exe) |
| 68. | .sdp | Datafile (Cocreate SolidDesigner) ◊ Scalable Multicast (RealAudio) |
| 69. | .sdpc | Datafile (Cocreate SolidDesigner) |
| 70. | .sdr | Drawing (SmartDraw) ◊ Music (Sounder) |
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