Problem opening PDF file email attachment in Edge (Default PDF) from my App

Thank for your response, LA.

I tried the following:

• executing Edge In Private,
• gave Permission "Full Control" to UserX
• Shared C:/Users/ with R/W with UserX

The result is same:

I try my app on 2 systems, on double clicking pdf file :

• On 1 system, I get the above results
• On 2nd system, when I double click the pdf attachment I don't get any results i.e. even Edge is not opened, no message dialog or any notification. So, I can't figure out what's going on over here. But, when I right click and select Quick Print -> MS Edge, it shows this error dialog :

I am on Win 10 Pro systems.

FYI, I would also like to share the code through which I launch the Outlook form my app. May be, some changes over there be helpful:

   '''

    ''' User's username.

    ''' User's password in the form of a SecureString.

    ''' User's domain name

    Private Sub LaunchOutlook(ByVal UserName As String, ByVal SecurePassword As SecureString, ByVal Domain As String)
        Log.Add("LaunchOutlook: UserName " & UserName & " SecurePass Length: " & SecurePassword.Length & " Domain: " & Domain)
        Dim OutlookProcess() As Process = System.Diagnostics.Process.GetProcessesByName("outlook")

        '' TD - 2/19/2019

        '' If Outlook instance is running, restores it

        If OutlookProcess.Count > 0 Then

            Dim mainWnd As IntPtr = OutlookProcess(0).MainWindowHandle

            Try

                ' For new (compatible) systems

                ShowWindow(mainWnd, 1) ' Restores minimized window, but not bring to front  - 9 (Restore), 1 (Normal), 5 (Show), 3 (Max)

                BringWindowToTop(mainWnd)

            Catch ex As Exception

                ' For old (incompatible) systems

                ShowWindow(mainWnd, 3)  ' Supports to open in Maximize state only

                SetForegroundWindow(mainWnd)

            Finally

                OutlookProcess = Nothing

                mainWnd = Nothing

            End Try

            Return

        End If

        Dim PSI As ProcessStartInfo = Nothing

        Try

            PSI = New ProcessStartInfo
            PSI.UserName = UserName
            PSI.Password = SecurePassword
            PSI.Domain = Domain
            Dim path As String = GetOutlookPath()

            '' Added WorkingDirectory

            PSI.WorkingDirectory = IO.Path.GetPathRoot(path)

            PSI.FileName = path & My.Settings.OutlookAppExe

            PSI.Arguments = My.Settings.OutlookAppArgs

            PSI.LoadUserProfile = True

            PSI.UseShellExecute = False

            If (IsNothing(OutlookProc)) Then

                OutlookProc = New Process()

            End If

            OutlookProc.StartInfo = PSI

            OutlookProc.Start()

        Catch ex As Exception

            Log.Add("LaunchOutlook Failed: " & ex.Message)

            Throw New Exception("Unable to launch Outlook: " & ex.Message)

        Finally

            If (Not IsNothing(OutlookProc)) Then

                OutlookProc.Close()

            End If

            PSI = Nothing

            OutlookProc = Nothing

        End Try

               Return

    End Sub

Btw, the systems are also under security restrictions. According to my Sr. that shouldn't affect this situation, yet something might be need to check or make clear.

Hope this helps. If you need any more info, please let me know.

Thanks, 

Tom

Thanks for your response, LA.

Yes, this occurs every time UserX is trying to view any pdf file and this is the issue from start, that till date we are not able to resolve this. 

UserX logs in our custom developed app and from there he can access his emails. We launch the Outlook using Process; the code of which is shared in previous post.

I am logged in in Windows system as myself or any other a/c, and in the app is logged as UserX trying to access his email through Outlook.

Reg Saving file :

• UserX saves file in his Docs, Downloads, etc dir. It would be saved in C:\Users\Temp.VCSO.0001. When I or user try to open the Temp dir, I get error : "
•       
• If I try to save the file in C:\, then I get error :
• 
• The only path I found, where UserX can saves and access the file is C:\Users\Public dir and sub-dirs.

I am a Developer in IT Dept, and right now this issue is given to me to solve it. At this point, manager is looking for solution irrespective of giving permissions/rights to users to access their attachments. I can have the admin rights.

Thank You, 

Tom