You can use GUI specifiers to enclose an entire do...except statement before individual statements, but you cannot use GUI specifiers before the except clause.
// legal:
do
mswxp Verify (expr1,expr2)
mswin7 Verify (expr3,expr4)
except
mswin7 reraise
mswxp if (ExceptNum () == 1)
Print ("err, etc.")
// NOT legal:
mswin7 do
Verify (expr,expr)
mswxp except
reraise