Prevent Hotlinking – Directory

Hi..

I have hosted all my files (exe,zip,rar) files in Dropbox… I have rewrite the dropbox url into https://www.mydomain.com/go/fileame using a wordpress plugin… if someone go to https://www.mydomain.com/go/fileame, then they can download the file… now i need to prevent hotlinking of those file… is there any way to stop by using the directory “/go/” ???

please help me…