This happends when your webhost doesnt allow files such as .mdl or other files that are unknown, usually it happends on free webhosts.
Try contacting your webhost to enable Directory Listing so all files are allowed on your website or just tell them if they could enable all files on your website they'll get what to do.
After that is done rename the model to a different name and try downloading it again.
Heres an example of Directory Listing enabled (NON-Private)
http://www.bloghash.com/wp-content/u...ry-listing.gif
An example of Directory Listing disabled (Locked/Private)
(it wont even show those files like when directory listing is enabled, it will say that it is private usually or that the webpage cant be found)
Linear Mode
