Installing .jar application in mobile phones

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Java

Hello All

I have developed an application for mobile phones in JavaME using Netbeans 7.2.

it running well in imulators but when i tried to install in on Nokia or other mobiles it says FILE NOT SUPPORTED after installing it in phone.

The .jar application is installed directly through web as below

Dim fileName As String = "MobileApp2.jar"
        Response.ContentType = "application/octet-stream"
        Response.AddHeader("Content-Disposition", "attachment;filename=" & fileName)
        Response.TransmitFile(Server.MapPath("~/Files/" & fileName))
        Response.[End]()

Please help, Why my file is not installing on phone?