The FSXP3DNavaids_Installer.exe program automatically checks the available simulator versions (a choice will be proposed if several are detected), then installs or uninstalls the necessary BGL files for it. When installing, only more recent BGL files than the current ones are replaced in the regions that have been selected. All default sim files are saved with a [.raxini] (FSX) or [.p3dini] (P3D all versions) extension in their initial directory. These backup files are necessary for uninstalling the package. So, DO NOT delete them.The FSXP3DNavaids_Installer executable is compatible with Windows XP, Vista, Windows 7, Windows 8/8.1 and Windows 10. For Vista and above, a pop up warning message will be displayed if you didn’t disable the Program Compatibility Assistant feature. In such a case, just select “This program installed correctly”.