eDrawings User Settings with 32 bit and 64 bit

We have some clients that are 32 bit and some that are 64 bit. Because eDrawings defaults to a different directory on 32 bit than 64 bit (Program Files vs. Program Files (x86)), the User Settings for the Viewer Path is different for the different clients. Is there a system environment variable that will make the path work for either directory? I'd rather not have to add an envirorment variable to every PC or move/reinstall eDrawings to a different directory on half the PCs. Or if there's another way other than environment variables, I'm all ears. Thanks for the help.