The software keeps a log up to date with all files that are put on your computer, so that you may audit it if you like. The location of this log depends on your operating system:

In Mac OSX find the log in your home folder. It is located at Applications/Yahoo!/BrowserPlus/InstallLog.txt.

Under Windows (XP or Vista), the log is placed in your My Documents folder: My Documents\Yahoo!\BrowserPlus\InstallLog.txt.