Skype has changed the delivery system files in your application, and now every time a file on Skype is received, now is downloaded automatically before this did not happen was the user who chose if discharged or not file, but with this update, application downloading automatically. However, there is a possibility that not, that is, to set it to download the application does not default. To achieve this, open Skype, click on Tools, Options Chat and SMS message settings click on the button and show advanced options. Once inside, we must uncheck the Accept incoming files automatically, and finally, press Save.
Now, whenever you receive a file, it will not be downloaded automatically, but will have to be us that we should press for download.