The Subject says it all. When I point the mouse to a big file (not necessarily select it) the browser crashes. After some examination I found the tooltip to be guilty for it because it displays the file size. I don't know the exact threshold size, but it happens with big video files > 1 GB.
Addition:
Big files of the decribed size can not be deleted (even when not selected with the mouse). Program crashes.
Browser crashes hovering the mouse over big files
Browser crashes hovering the mouse over big files
Struggling with Windows 7 Pro 64. The worst and buggiest BS OS ever existed.