The first thing that will help you determine if a particular file is a legitimate Windows process or a virus, is the location of the executable itself. Is sidebar.exe safe, or is it a virus or malware? (optional offer for Reimage - Website | EULA | Privacy Policy | Uninstall) Recommended: Identify sidebar.exe related errors Please read the following to decide for yourself whether the sidebar.exe file on your computer is a virus or trojan horse that you should delete, or whether it is a valid Windows operating system file or a reliable application. In some cases, executable files can damage your computer. exe extension of a file name displays an executable file. The software is usually about 1.64 MB in size. Sidebar.exe is an executable file that is part of the Windows Sidebar program developed by Microsoft Corporation.