In opensuse 64 bit you can change in yast the wine architecture, so choose the 32 bit version (the i586 package) and remove wine-32bit package. It will pull a certain number of 32bit libraries but that's not a problem; since i've began to install wine on my opensuse 64bit this way almost all program i've tried to run work flawlessly. Obviously you will be able tu run only 32 bit windows executables. Hope this helps.
