CuteFTP Server can block the upload or download of certain files. You can specify which files to block using wildcards or exact file names.
Start the Administrator Interface and connect to the Server.
At the bottom of the left pane, click the Server tab.
In the left pane, select the Site you want to modify.
In the right pane, click the Advanced tab.
Select the Exclude the following files from the site check box. Enter the filename or wildcard representation (*.mp3 or *.mp?) for the file(s) you want to exclude from the site. If you have more than one entry, separate each with a comma.
Click Apply.
Blocking site-to-site transfers