Notes about the GPT 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 GPT file type is primarily associated with 'MicroImages' by MicroImages, Inc.. This file type is sometimes used by various MicroImages products. It is not common so you may not see it. Group saved as text, rather than in .RVC Project File Format.