deploying a web player buildss

I’ve built the web player, it’s given me the two files in a folder (the .html and .unity3d files). Then I ftp it to my web server, but it’s not working when I go the site in my browser (error to download data file).

But if I just click the local file that’s built from unity before ftp’ing it, it works.

What am I doing wrong?

For anyone in the far future, I figured it out. I have a Windows server, and just had to add the mime type on my server.

file extension: .unity3d
mime type: application/vnd.unity