This file is a harmful and undesirable program. Probably virus. It's recommended to delete it.
What is msapp.exe Windows startup process
File name: msapp.exe
Program name: WinApp32
Description: RSBOT TROJAN
Information added by: DonKR at 22 April 2008
Hint: If msapp.exe file is a virus or trojan, we recommend to use a antivirus software or registry cleaner.
We are presenting list of Windows processes, startup files.
Name of msapp.exe is WinApp32. Some of them are viruses, so you should use a antivirus program.