Notes about the W3P 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 W3P file type is primarily associated with 'WarCraft III' by Blizzard Entertainment. The record of a person's progress in the Single-Player Campaign mode of the game. The .W3P file is paired with the .W3V file to make up the progress record for the Single-Player Campaign mode; their functions are identical.