Error message when you try to install an application on a Windows Vista SP1-based or Windows 7 computer: "Command line option syntax error."

KB Article:


Consider the following scenario.

  • You are running a Windows XP Service Pack 3 (SP3), Windows Vista Service Pack 1 (SP1) or a Windows 7 based computer
  • You use a user name that includes a double-byte character set (DBCS) character.

When you try to install an application that uses the Microsoft Visual C++ 2005 Redistributable Package, you receive the following error message:

Command line option syntax error. Type command/? For help.