Notes about the MUL 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 MUL file type is primarily associated with 'SeeYou' by Naviter. SeeYou is a planning and analysis tool for glider pilots. It is designed for the desktop and notebook PCs.