Notes about the CTN 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 CTN file type is primarily associated with 'CADTERNS' by CADTERNS Custom Clothing Inc.. CADTERNS is a personal patternmaking program that enables anyone to draft personal slopers (basic sewing patterns). The file extension changed from PAT to CTN in Version 5.0.33.