How to get here: In Settings on the General Settings tab, select [General Settings] > General > File Types > Generic Source.

generic source file A file of a programming language that Doc-O-Matic does not understand natively and interprets as DTX file. Comment styles must be specified and topic identifiers must be inserted manually for each symbol. For example, VB6, Ada and SQL files are generic source files. 

parse To break source code into smaller chunks so that source code symbols can be sorted and comments extracted. 

file extension A set of characters added to a filename that serves to extend or clarify its meaning or to identify a file as a member of a category.