.COS2 File Extension
File TypePinnacle Studio Cache File
What is a COS2 file?
Temporary file created by some versions of Pinnacle Studio, a program used for editing videos; stores information for a specific resource, such as a .WMV or .WMA file; generated automatically by Pinnacle Studio when in edit mode.
COS2 files can be safely deleted. Pinnacle Studio will regenerate them the next time a project is edited.