Notes about the RW 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 RW file type is primarily associated with 'Boso View Express' by Mackoy. Japanese Site. Railway defintion file for the Boso View Express (BVE) train simulator. The program also uses B3D files for structures, and the CSV format for both railways and structures used within railways (in the new format).