What is "the printersize number" ? Where it's stored?

>I used struct.vcx in order to get the printersize number (Article #304639), I have added:
>
>SET CLASSLIB TO STRUCT.vcx
>If not "convert" $ Upper( Set("Library") )
>Set Library to (Home()+"\convert.Fll") Additive
>Endif
>
>to the main.prg but the same error still happens.
>
>where is the right place to add the convert.fll?
>
>is there any way to to get the printersize number besides struct.vcx?
>