I don't have Office 2011 but the path (for Office 2008) is ~/Library/Preferences/Microsoft/Office 2008/OLE Registration Database 2008. There is also a file named OLE Registration Database 2008 (Converter) in the same location.
MS Office is not crashing for me so I assume that everything is hunky-dory.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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