AppSearch Table: Windows Installer can use AppSearch to
search for a specified registry entry, file, or folder while installing your
package.
AppSearch searches
your computer for file signatures that you specify in the AppSearch table of
the Windows Installer package. If AppSearch locates a file, a registry key, or
a folder that has the signature that you specified, AppSearch returns search
results as a property. You can use this
property to establish a launch condition. If the condition that you set is
not satisfied, the launch condition quits the installation process.
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