Notes about the VHDL 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 VHDL file type is primarily associated with 'Quartus II' by Altera Corporation. Quartus II design software is a comprehensive environment available for system-on-a-programmable-chip (SOPC) design. Quartus II replaces the MAX+PLUS II Software for chip design. These files were also used by MAX+PLUS. This is a text file used in design projects.