This is the default action.
e Replaces a file when the setup program detects the file is missing or it finds another
application has installed an equal or older version of the file.
d Replaces a file when the setup program detects the file is missing or it finds another
application has installed a different version. This action replaces the file even when the file
is newer than the one used by the application.
c Replaces a file when the setup program detects the file is missing or the file??™s checksum
does not match the calculated value. This option often helps you locate and replace files
tainted by viruses.
a Forces the setup program to reinstall all files.
u Updates all required user-specific registry entries.
m Updates all required computer-specific registry entries.
s Updates all existing shortcuts.
v Runs the setup program from a source media and caches the local package to the hard
drive. This command line switch replaces the local package when it already exists.
You may have noticed more than a few references to properties in this section. Adding properties
to the command line changes the way in which the MSI package unpacks.
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