The Exclude files from being cached machine setting should be configured correctly. This policy enables administrators to exclude certain file types from being made available offline. You need to specify file extensions of the file types that should be excluded. A user will then be unable to create a file of this type in the folders that have been made available offline. Fix: (1) GPO: Computer Configuration\Administrative Templates\Network\Offline Files\Exclude files from being cached (2) KEY: HKLM\Software\Policies\Microsoft\Windows\NetCache\ExcludedFileTypes