RESOLVED: Find our what cultures are supported.

[The Monk]

How can I find out what cultures are supported by the user's PC?

For instance...

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim LocRM As New ResourceManager("WindowsApplication2.WinFormsStrings", GetType(Form1).Module.Assembly)
        Dim xCulture As System.Globalization.CultureInfo
 
        Thread.CurrentThread.CurrentCulture = New System.Globalization.CultureInfo("ar-SA")
        Thread.CurrentThread.CurrentUICulture = New System.Globalization.CultureInfo("ar-SA")
 
        xCulture = Thread.CurrentThread.CurrentCulture
 
        MessageBox.Show(LocRM.GetString("strMessage", xCulture))
 
    End Sub

... presumably isn't going to work if the OS does not support "ar-SA" as a culture, even if I provide the WinFormsStrings.ar-SA.resx file.

How can I find out if the .resx files I distribute are supported by the user's OS or not?