MAKEMSI quickly and reliably creates MSI files in a non-programmatic way\Windows Installer FAQ (the basics)Resource Life CycleNever Overwrite Existing Resources

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Never Overwrite Existing Resources

The main choices are:

1. The resources are members of a component, and a component has attributes including the "NeverOverwrite" flag.

2. The resources are members of a component, these have conditions associated with them which you may be able to set, for example you could use a custom action or RegistryRead or FileFind (not so easy) commands to search for the resource and use the resulting property in the condition.

3. One or more custom actions to perform all the update and removal logic.

EXAMPLE - Environment Variable

<$Component "ENVVAR_SOMEVAR" Condition=^%ENVVAR_SOMEVAR = ""^ Directory_="<$AnyDir>" LM="Y">
   <$Environment NAME="SOMEVAR" VALUE="[INSTALLDIR]" SYSTEM="Y">
<$/Component>

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