Set the Component value Permanent="yes" like so:
<Component Id="LicenseDoc" Guid="*" Permanent="yes">
<File Id ="License.rtf" Source="$(var.SolutionDir)Installer\License.rtf" />
</Component>
Remarks:
- This definition has to be done in the installed MSI as well as the upgrading MSI. If the base MSI did not have a component Id this file will be deleted regardless of the
Permanent="yes"