Can I delete the tracing folder?
It’s used by Windows Update mechanisms. If you aren’t in the middle of installing updates, it’s usually safe to delete (although I recommend just keeping it in your Recycle Bin for a while just in case something goes wrong and you need it back).
What is the tracing folder on my C drive?
Everything under %username%Tracing seems to be diagnostic logging and debugging data created by apps that use the Unified Communications Client API, such as Office Communicator/Lync, Windows Live Messenger, Skype etc.
What are tracing files?
A trace file is a file containing a trace of certain events that happen (or will happen) during some process.
Can I delete Skype media stack?
You can safely delete all these Media Stack files. They were created by older Skype versions and are of no use anymore. These files contain information on media capabilities of Skype.