Better select where to remove short file names

Use the FileName column itself instead of the file ID. This is less
susceptible to changes in file IDs (and component IDs) that may happen
when relying more on default behaviors in future WiX versions.

installer/modify_msi.vbs

@@ -34,19 +34,16 @@ Dim record
 Set record = view.Fetch
 Dim gFile, pos
 Do While not record Is Nothing
-gFile = record.StringData(1)
-If Left(gFile, 8) = "psqlodbc" Then
-	gFile = record.StringData(3)
-	' Check if the FileName field is ShortName|LongName
-	pos = InStr(record.StringData(3), "|")
-	If pos > 0 Then
-		' Omit the ShortName part
-		gFile = Mid(record.StringData(3), pos + 1)
-		WScript.echo record.StringData(3) & " -> " & gFile
-		' And update the field
-		record.StringData(3) = gFile
-		view.Modify msiViewModifyUpdate, record
-	End If
+' Check if the FileName field is ShortName|LongName
+gFile = record.StringData(3)
+pos = InStr(gFile, "|psqlodbc")
+If (pos > 0) Then
+	' Omit the ShortName part
+	gFile = Mid(gFile, pos + 1)
+	WScript.echo record.StringData(3) & " -> " & gFile
+	' And update the field
+	record.StringData(3) = gFile
+	view.Modify msiViewModifyUpdate, record
 End If
 Set record = view.Fetch
 Loop