| dhs | HyperSnap Captured Drawing |
| dhx | Datamine Studio Data |
| diag | Microsoft Windows Troubleshooting Pack Designer Data |
| dic | Microsoft Office Custom Dictionary |
| dict | DICT Data File |
| did | Verity Server Index Data File |
| dii | AD Summation iBlaze Data |
| dil | DesignComposer Presentation Input Script |
| dim | Direct Internet Message Encapsulation Data |
| dime | Direct Internet Message Encapsulation Data |
| dip | DVDINFOPro Data |
| dipx | DVDINFOPro Data |
| dis | MSC Patran Displacement Results |
| disp | Altair OptiStruct Displacement Data |
| dist | PLINK Genomic Hamming Distance Matrix |
| dit | Windows 2000 Active Directory Data Store |
| dita | DITA Document |
| ditamap | DITA Topic Map |
| ditaval | DITA Conditions Data |
| dix | Apertium Monodix Dictionary Data |
| dix | Stonevoice Translator Custom Dictionary |
| diy | My Drivers Backup Setup |
| djd | Digital Juice Juicer Data |
| djf | NTI Backup Now Drive Backup |
| djm | Dynojet Map Data |
| djp | DJPrint Data |
| dkd | JBK Karaoke Data |
| dkf | DriveCrypt Key File |
| dklang | DKLang Translation Editor Translation Data |
| dkn | ONETEP Density Kernel |
| dkr | Cisco MDS 9000 DKR Data |
| dkt | d-lusion Drumstation Saved Drum Kit |
| dl | FLEXnet Manager Debug Log |
| dl4 | Lindab DIMsilencer Data |
| dla | Defense Department DLA Procurement Data |