Server error while playing a video: HTTP Error 404.3

[brille]

i have an application where i require to upload a video as:html\[code\]<iframe id="frame1" runat="server" visible="false" style="height: 222px; width: 482px;"></iframe>\[/code\]Code\[code\]Finalpath = filepath + filename;frame1.Visible = true;frame1.Attributes.Add("src", Finalpath);\[/code\]but when i load the video Extension \[code\]Mp4\[/code\] it shows the error in \[code\]Iframe\[/code\] \[code\]HTTP Error 404.3 - Not Found\[/code\]The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.how to handle this Server Error and what type(extension) of video i can upload? thanks for any assistance..