The setting files are stored in a different place for each user. To find them, click the start menu, click run, and paste:
%USERPROFILE%\Local Settings\Application Data\
and press enter. There will be a folder with your “Company Name” (whatever it is set to in your assembly) and then some more subfolders. The settings are stored in user.config.
Full path:
%USERPROFILE%\Local Settings\Application Data\<Company Name>\
<appdomainname>_<eid>_<hash>\<verison>\user.config.
In Windows Vista and newer, these are stored under:
%USERPROFILE%\AppData\Local\
More info: