Shell function and wkhtmltopdf in vb

I need to to convert html files into pdf. I found this program, wkhtmltopdf, that seems to meet my needs. It runs from a command line, which I call by means of the shell function. I succeed doing basic conversion, but as soon as I try to customize it using some options, the program does nothing. I must missuse either the shell function or wkhtmltopdf itself, but I don't know what I'm doing wrong. I tryed with other basic options but none seems to work.

In the code attached Com0  works fine (there is no option), but Com1 fails. The latter uses an option I'm interested in (disabling the smart shrinking propoerty)

Dim Com1 As String, Com0 As String
    Dim path As String
    Dim Id As Double
    Dim File As String, File1 As String


    path = "C:\Documents and Settings\Francesc\Mis documentos\E-Gestion\wkhtmltopdf\wkhtmltopdf.exe"
    File = "file:///C:/Documents and Settings/FFFF/A.html"
    File = Replace(File, "\", "/")
    File = Replace(File, " ", "%20")
    
    File1 = "C:\Documents and Settings\FFFF\A.pdf"
    Com0 = path & " " & File & " " & Chr(34) & File1 & Chr(34)
    Com1 = path & " " & File & " " & Chr(34) & File1 & Chr(34) & " --disable-smart-shrinking"

   
    Call Shell(Com)

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