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One File Has a Version

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If the key file of a component being installed (copy-A) has the same name as a file already installed in the target location (copy-B), the installer compares the version number, date, and language of the two files.

If only one of the files has a version number, the installer uses the logic illustrated by the following flow diagram to determine whether to replace all of the installed files belonging to the component. Because the installer only installs entire components, if the installed key file is replaced, then all of the component's files are replaced.

Note that this diagram illustrates the default File Versioning Rules, which can be overridden by setting the REINSTALLMODE property. The default value of the REINSTALLMODE property is "omus".

default file versioning rules when only one file has a version number

See the examples of default file versioning in Replacing Existing Files.