title: AjaxFileUpload.axd fails when uploading MOV file using ajaxToolkit:AjaxFileUpload
body: <p>I have setup a ajaxToolkit:AjaxFileUpload control and this works like a charm when uploading image files but when selecting a MOV file it fails with following error</p>
  
  <p>[Exception: File extension is not allowed.]
     AjaxControlToolkit.AjaxFileUploadHelper.Process(HttpContext context) +604
     AjaxControlToolkit.AjaxFileUploadHandler.ProcessRequest(HttpContext context) +180
     System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +812
     System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +132
     System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +73</p>
  
  <p>The URL that is called when uploading is as follows</p>
  
  <p><a href="http://localhost:59486/AjaxFileUploadHandler.axd?contextKey=" rel="nofollow noreferrer">http://localhost:59486/AjaxFileUploadHandler.axd?contextKey=</a>{DA8BEDC8-B952-4d5d-8CC2-59FE922E2923}&amp;controlID=ContentPlaceHolder1_AjaxFileUpload1&amp;fileId=5F30E222-9559-18CF-EFEB-3B1A29EE91B5&amp;fileName=IMG_3946.MOV&amp;chunked=true&amp;firstChunk=true</p>
  
  <p>the URL that is called when uploading a jpg is as follows and  this works</p>
  
  <p><a href="http://localhost:59486/AjaxFileUploadHandler.axd?contextKey=" rel="nofollow noreferrer">http://localhost:59486/AjaxFileUploadHandler.axd?contextKey=</a>{DA8BEDC8-B952-4d5d-8CC2-59FE922E2923}&amp;controlID=ContentPlaceHolder1_AjaxFileUpload1&amp;fileId=A58166B8-1515-FBB6-5474-600038099117&amp;fileName=Kauslunde%20Fodbold%20-%20Oldboys.jpg&amp;chunked=true&amp;firstChunk=true</p>
  
  <p>How to fix this issue?
  If I change the .mov file to .mov.jpg I can upload the file with no problem.
  So how do I tell that MOV files should be allowed?</p>
  
  <p>The markup is as follows</p>
  
  <pre><code>&lt;ajaxToolkit:AjaxFileUpload ID="AjaxFileUpload1" OnUploadComplete="AjaxFileUpload1_UploadComplete" runat="server" ValidateRequestMode="Disabled" ChunkSize="100" /&gt;  
  </code></pre>