Notes about the JC 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 JC file type is primarily associated with 'FlashGet' by Beijing Zhitongwuxian Tech, Ltd.. FlashGet is a download manager that uses the MHT (Multi-server Hyper-threading Transportation) technique, supports various protocols and has document management features. FlashGet is freeware. FlashGet used to be called JetCar. It uses the .JC extension while a file is being downloaded and then renames the file appropriately when the download is complete.