java - Automating IE8 download window using WinApi -

my current task automated testing of enterprise web-based software suite using selenium on java.

i've more or less done trick using jna , winapi, unfortunately, i've hit nasty snag.

while changing path download location via wm_settext message, visual content of file path changes, , after clicking save button still saves suggested location. gives?

is there way can make ie8 think entered path manually, or, perhaps send other message trigger processing of changed address?

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a little background:

unfortunately, selenium cannot handle file downloads, , need verify validity of to-be-downloaded file simple http 200 code check not suffice.

automatic file downloading out, i'm stuck ie8, not support it. direct http requests out - sso authentication , https have caused many problems down research vector.

p.s.: unfortunately, cannot provide direct code snippet due nda, proprietary limits , other dull limitations...