What is mainwnd.exe? Should I remove it?

mainwnd.exe is an executable file that starts a malicious process, launches certain parasite components or runs a destructive payload. Even if the mainwnd.exe file does nothing suspicious, its presence indicates that your computer is infected with a particular threat.
The mainwnd.exe file is installed and used by KidLogger.
You have to delete the mainwnd.exe file immediately after you have found it. The parasite will continue to violate your privacy and harm your computer unless mainwnd.exe and all related objects will not be completely removed from the system. If you have difficulties erasing the file consider using an anti-spyware program.
In some cases a presence of mainwnd.exe does not mean that your system is infected. The file may actually belong to some fully legitimate applications and therefore must stay intact. If you are in doubt, please scan the mainwnd.exe file using you regular spyware remover or antivirus program. File mainwnd.exe is related to KidLogger.