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The "Use Office rich edit control" installation option will copy the latest riched20.dll file from your Office installation(s) to the Ultra Recall installation folder (for use by Ultra Recall).
Later versions of the riched20.dll control distributed with Office (of which there are many!) offer better display of advanced rtf features such as tables and other formatting (which would be a reason to check this option during installation).
Unfortunately some of the later riched20.dll files (all produced by Microsoft) are quite buggy and have been known to cause applications using them to behave unpredictably which is why the use of the latest version is optional -- if the installation option is not checked Ultra Recall will use the base system riched20.dll file, typically older and with less features, but stable with few "bugs".
You can search the forum for more details on the various rich edit control versions...
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