Notes about the CTFSYS 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 CTFSYS file type is primarily associated with 'OS X' by Apple Inc.. The Mach kernel in Mac OS X is in mach_kernel.ctfsys on the root folder of the drive.