Archicad library part is the basic item through which the CAD software Archicad handles external dynamic content elements which are grouped into libraries. A library part is a file in a library.

A library part can be any file used by Archicad for the following purposes:

• a file with GSM extension containing a model written in GDL or using 2D- or 3D binaries
• a background image for rendering
• an image for texture mapping for 3D and rendering
• a text file for listing
• a LightWorks material file (LWI)
• a DXF file
• a file of any type, which is registered by Archicad or by an add-on as library part through Library Manager

Usually a library part refers to an object scripted in GDL.