Object library that contains data types and constants referenced by MS Office components; may cause certain Microsoft programs to not function correctly if moved or renamed. OLB files are also referred to as Office Object Library files.
CAD file used by OrCAD, a program used for designing printed circuit boards (PCBs); saves "symbols," which are the electric circuit components that can be put together to construct a PCB design; often used as a library for defining virtual circuit components that match the specifications of real-world circuit components. OLB files are often included as part of an OrCAD project (.OPJ file).
The olb file extension is associated with PSpice, a full-featured, native analog and mixed-signal circuit simulator, developed by Cadence Design Systems, Inc.. The olb files are used to capture symbols model.