wintest when name is empty

[ssimop]

I understand that when in wintest window name is empty it implies "accept all". There exists a case of a third party application using an empty class #32770 window. I am in need to check in a filter function, namely :
Function FF_FlashFol_v0

Code:

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;/
;Allows starting macro only in certain window.
function# iid FILTER&f
_s.getwintext(f.hwnd)
if(empty(_s)) ret iid
;if(wintest(f.hwnd "" "#32770")) ret iid

I concluded to this workaround. I wonder whether I can still use wintest somehow.
Many thanks in advance for any suggestion.