I recently installed Windows 7 64 bit (previously had 32 bit vista) and u8tool wouldnt work no more. It said missing comdlg32.ocx
This is how i solved the problem.
1. Download comdlg32.ocx http://windowsxp.mvps.org/utils/Comdlg32.zip
2. Extract it to c:\Windows\SysWOW64\
(NOT to the system32...