EXE file and NT Server

I havent been able to get the problem solved as asked in the previous question on Downloading the file and NT Server.
The file gets downloaded in the Local machine if i keep the .exe file in WWWRoot and the same has been followed in the WebServer where the site is being hosted.
Still i am not able to get the file downloaded.Rather it gives me error of Unauthorised due to ACL on Resource.

Please this is important and i need a quick and corect solution. Rights on the file are correct and also the user on the webserver is authorised to download the file. The file System is NTFS