Winmx 3.31 is no longer supported, please do not add the oledlg.dll to winmx 3.31 as you will find certain parts do not work. Winmx 3.31 is no longer supported as it has many buffer overrun problems that can cause people to be able to crash your winmx. This is why their are no 3.31 installers on the patch site.
Please do not run 3.31