I found a bug in WinSCP 3.74.
I just put WinSCP 3.74 on a fresh install of Windows XP SP2 on my laptop.
I choosed to install this soft in French.
Everything works except that if every time I launch the program, it says (in French) "Invalid Memory Access". More over, you can't save any application preferences like explorer selection style, external editor, panels state...
After some investigations, I decided to replace the files WinSCP.fr by a fresh downloaded version from this website. No way, same problem.
So I removed this files : Now my WinSCP is in English (it's ok for me) and I don't have any memory error nor problem with preferences saving.
I don't know if it's only the French translation that causes this bug. I don't have time to check the other languages.
Now waiting for version 3.75 of WinSCP :P