.DLT
From Emperor's Hammer Encyclopaedia Imperia
.DLT files are saved DELT sections of .LFD files. DELTs are not files. DELTs are resources contained in LFD files. They are extracted to .DLT files by DF2. You can put them back to LFD using 2DF. DELT files are used for static pictures in the cutscenes, mouse cursors and mission briefings in Dark Forces.
