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After installing Skype, users can send files to different network by right clicking on file and selecting Skype to send context menu. In order to prevent file transfer through skype, add the following registry HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Skype\Phone add a dword "DisableFileTransfer" with value 1

To disable file transfer through Skype, you need to create this entry in registry HKLM\Software\Policies\Skype\Phone Create a Dword  DisableFileTransfer with a value 1 You can change HKLM (local machine) to HKCU to disable file transfer for current user only. Don't forget to restart Skype after applying changes to registry.