Problems with showing images from disk in HTML.

I have html document given by email html body (it starts with <html xmlns:v= ). I am showing this in HTML form control. In that are some images. The images with src on internet are shown correctly. but there are some images on disk which are not shown . I am seting the path to the files by WinApi::setCurrentDirectory (and images are in right folder) but it does not help. What else I should set?