There are two file extensions used to store lexer resources:
*.LCF Single lexer configuration
*.LXL Lexer library
All this files have "Delphi Form Resource" text format.
To manage this files you may use "Manage Library" dialog. This dialog contains commands: save/load lexer library (*.LXL), import/export single lexer (*.LCF). Library already contains lexers for common filetypes. You can add more lexers from "\HL" folder to library by importing them.