Notes about the TGWORLD 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 TGWORLD file type is primarily associated with 'Terragen' by Planetside Software. Terragen is a work-in-progress scenery generator for Windows and the Mac OS.