Http.sys Bad Request (Reason - URL)

Hi,
I have a virtual directory hosted in 2008 server R2 iis with Directory Browsing enabled.
The virtual directory has sub-folder named :
ים לכב
When I try to browse this sub-folde i get 400 bad request.
The request is being rejected within http.sys driver (I can see it in "C:\Windows\System32\LogFiles\HTTPERR\httperr.log")with the reason "url".
the encoded name is :
%D7%99%D7%9D%20%D7%9C%D7%9B%EF%80%A0%D7%91
(the line from the httperr.log "2015-03-24 10:04:43 ::1%0 49345 ::1%0 80 HTTP/1.1 GET /Test/%D7%99%D7%9D%20%D7%9C%D7%9B%EF%80%A0%D7%91/ 400 - URL -" )
Any Ideas?