FileInfo.com - The File Extensions Resource

.DAL File Extension

File Type 1	Download Accelerator Plus URL List (Most common)
File Format	File
Common?	No
File Description	List of download URLs exported by Download Accelerator Plus (DAP); stores the locations of downloadable files in a format that can be imported by DAP; may be used to share download lists between multiple computers. To import a DAL file, select File->Import and browse to the DAL file.
Program(s) that open dal files	Windows: SpeedBit Download Accelerator Plus (DAP)

File Type 2	DVD-lab Project File
File Format	Proprietary File
Common?	No
File Description	DVD authoring project created with DVD-lab or DVD-lab PRO; contains project settings and references to media files that are included in the project; can be burned to a DVD disc when completed.
Program(s) that open dal files	Windows: MediaChance DVD-lab; MediaChance DVD-lab PRO

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/dal