ShellFolderFix basically an app to make Windows 7 explorer folder windows remember their size and position. It has a couple of additional features too, and hopefully some more later on. It does NOT manage window size/positions of regular applications, if you want that, other apps like Window Manager do it. Allthough I haven't tried it, in theory it should work to run Window Manager simultaneously, if it's configured to ignore folder windows (found as "CabinetWClass"). I'd strongly recommend configuring WM to ignore them, or disable WM, before running ShellFolderFix, to avoid any potential "fighting" between the two apps.
ShellFolderFix is a small application that allows you to enable folder and size position saving as well as maintaining folder browsing history between sessions. Once you set the options you want and send the application to the system tray you never need to bother with it again, it runs in the background keeping track of the folders and restoring them to their respective positions
The license of this software is Freeware, you can free download and free use this shell extension software.