Notes about the PRB file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The PRB file type is primarily associated with 'PSpice' by Cadence Design Systems, Inc.. PSpice is a SPICE analog circuit and digital logic simulation software that runs on personal computers (thus the first letter P in its name). It was developed by MicroSim and used in electronic design automation. MicroSim was bought by OrCAD which was subsequently purchased by Cadence Design Systems. The name is an acronym for Personal Simulation Program with Integrated Circuit Emphasis. Today it has evolved into a analog mixed signal simulator.