"Failed to download data file"?

Scripting
1

After I publish my web on the web server, I try to run it, but it “Fail to download data file”!
(version 3.1)
What’s wrong with it? help!

2

First of all make sure URL is correct :] Then I think you need to set MIME type to “application/vnd.unity” for .unity3d files.

3

Thanks for help. I post my project on a free web space, so i cant set the MIME type, but when i try to rename the .unity3d to .zip, it works!
(I wonder it would cause another problem)
Thanks to ignas2!