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c - Reinstalls if file is missing or the stored checksum does not match the calculated value.

d - Reinstalls if file is missing or a different version is installed. e - Reinstalls if file is missing or an equal or older version is installed. o - Reinstalls if file is missing or an older version is installed. The default argument list for this option is 'omus.' This option shares the same argument list as the REINSTALLMODE property. This option ignores any property values entered on the command line. The Standard Installer Command-Line Options are also available beginning with Windows Installer 3.0. The command-line options in the following table are available with Windows Installer 3.0 and earlier versions. Command-line options are case-insensitive.

Note that Msiexec also sets an error level on return that corresponds to system error codes. The executable program that interprets packages and installs products is Msiexec.exe.