$plik1 = "C:\Users\Zmylna\Downloads\Bez tytułu20200424033430215.jpg"   ;<<<< string returned by my fuction - Not working
$plik2 = "C:\Users\Zmylna\Downloads\Bez tytułu20200424033430215.jpg"   ; string manualy written in scite for test - Working

$A = StringCompare($plik1, $plik2)
MsgBox(0, "", $A)
; Function returns -1

If $plik1 = $plik2 Then
	MsgBox(0, "", "Strings are equal")
Else
	MsgBox(0, "", "Strings are not equal")
EndIf
;If returns "Strings are not equal"

ConsoleWrite($plik1 & @CRLF)
ConsoleWrite($plik2 & @CRLF)

; Console write output:
;C:\Users\Zmylna\Downloads\Bez tytu³u20200424033430215.jpg
;C:\Users\Zmylna\Downloads\Bez tytu³u20200424033430215.jpg