Cannot show html-file in a new TAB

Hello, all...
I have a button on my page (using AJAX) that shows an html-file in a new browser TAB.
This works great on my local VS2012 ASP.NET project.
However, when I upload the report pages to Winhost server, the button does NOT show the html-file at all.

My Code is as follows:
Dim sFileShortName As String = "HistoryDateFleetReport.html"
Dim sFQFName As String = "~\HTML_Reports\" & sFileShortName
Dim sServerFileName As String = HttpContext.Current.Server.MapPath(sFQFName)
sRet = sServerFileName
lblFileName.Text = sFQFName
lblMapPath.Text = sRet

The last two sentences place the Filename and MapPath into the page so I can see them during execution as follows:
sFQFName = "~\HTML_Reports\HistoryDateFleetReport.html " << as expected
MapPath = "E:\web\nnnnnn\HTML_Reports\HistoryDateFleetReport.html " << Is this correct?

I know that the generated html-file is created on the Winhost server and using FileZilla -- I can view the html-file in a browser.

Here is the code that LAUNCHES the html-file:
Dim strFileName As String = hidReportHtmlName.Value

' Display into a new browser-tab.
System.Diagnostics.Process.Start(strFileName)

Response.ContentType = "application/html"
Response.AddHeader("content-disposition", "attachment;filename=" & strFileName)
Response.Cache.SetCacheability(HttpCacheability.NoCache)
ScriptManager.RegisterClientScriptBlock(cmdLaunchReport, Me.GetType(), "HelpOnLoad", "window.open('" & strFileName & "','_blank','location=0,menubar=0,status=0,titlebar=0,toolbar=0');", True)
Try
Response.End()
Catch ex As Exception
Thread.Sleep(1000)
End Try

Any suggestions as to what is going wrong here in the Winhost server? Bad file-path? Bad MapPath?
Thanks.

 

Thank you for your reply...
The value of 'strFileName' is that of the MapPath which is "E:\web\nnnnnn\HTML_Reports\HistoryDateFleetReport.html ".

The problem is that the generated html-file does not appear in a new IE10 browser tab when run from the Winhost server, but DOES appear as expected when run locally from within the VS2012 project (debug-mode).
That is why I was seeking assistance on the Winhost MapPath value.

Is there a permissions/security option not being set on the Winhost server that should be set?
What could cause this code to fail?
I will now try to capture the CATCH ex message-text and place it into the page.

Any advice will be greatly appreciated.
Thanks.

 

I again thank you for your reply.
I have narrowed down the problem to this sentence from the above code.
System.Diagnostics.Process.Start(strFileName)
I find on my VS2012 project that this sentence actually opens the report into a new IE10 browser tab on my local computer, but NOT in Winhost.
Where the 'strFileName' has a value of "E:\web\nnnnnn\HTML_Reports\HistoryDateFleetReport.html", which is the Server.MapPath.

The other code (from above, starting with Response.ContentType = "application/html") has been commented out so that the window.open does not execute.

Are we allowed to start a process within Winhost application code?
What else is needed to open an html-file in a new browser tab on Winhost?

Your comments are welcome.
Thanks...John