BlockWerx General terms:

• Library: A BlockWerx Library represents a Windows folder and any sub-folders (of drawings and related files) as well as any associated settings for display and insertion.

• BlockWerx Library File (*.bxl): this is an ini style text file which contains all the information about one or more Libraries (when loaded they become tabs)
• BlockWerx Data File (BlkWerx.bxd): this is an ini style text file which contains drawing specific information such as the Description. There may be one of these in any folder where a description or other data has been saved for a drawing.
• BlockWerx Runtime Extension (*.brx): this is a BlockWerx plugin file (they are only avialable in the Pro version).
• BlockWerx Lookup File (*.blu): this is a user-created ini style text file which contains cross reference information for use in searching.
• CADwerx License File (*.cxl): this is an encrypted text file which contains your license, DO NOT EDIT.

• Roll-up: this control collapses and expands any child controls associated with it. The 'Main', 'Browse', 'Filter', and 'Preset Insert Parameters', controls on the main dialog are Roll-ups. In this screen shot the 'Browse' roll-up is expanded -