Ok, I found my answer. Thanks for letting me post my question in here. Next, I post a code that works just fine. The only thing that remains incomplete is that I can not add filters for types of files like *.CATParts or *.CATProducts in this code. But it works for me already.
Function SelectFile( )
' File Browser via HTA
' Author: Rudi Degrande, modifications by Denis St-Pierre and Rob van der
Woude
' Features: Works in Windows Vista and up (Should also work in XP).
' Fairly fast.
' All native code/controls (No 3rd party DLL/ XP DLL).
' Caveats: Cannot define default starting folder.
' Uses last folder used with MSHTA.EXE stored in Binary in
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32].
' Dialog title says "Choose file to upload".
' Source: https://social.technet.microsoft.com/Forums/scriptcenter/en-
US/a3b358e8-15ae-4ba3-bca5-ec349df65ef6/windows7-vbscript-open-file-dialog-
box-fakepath?forum=ITCG
Dim objExec, strMSHTA, wshShell
SelectFile = ""
' For use in HTAs as well as "plain" VBScript:
strMSHTA = "mshta.exe ""about:" & "<" & "input type=file id=FILE>" _
& "<" & "script>FILE.click();new
ActiveXObject('Scripting.FileSystemObject')" _
&
".GetStandardStream(1).WriteLine(FILE.value);close();resizeTo(0,0);" & "<" &
"/script>"""
' For use in "plain" VBScript only:
' strMSHTA = "mshta.exe ""about:<input type=file id=FILE>" _
' & "<script>FILE.click();new
ActiveXObject('Scripting.FileSystemObject')" _
' &
".GetStandardStream(1).WriteLine(FILE.value);close();resizeTo(0,0);
</script>"""
Set wshShell = CreateObject( "WScript.Shell" )
Set objExec = wshShell.Exec( strMSHTA )
SelectFile = objExec.StdOut.ReadLine( )
Set objExec = Nothing
Set wshShell = Nothing
End Function
Kind regards