AutoRun plug-in is failing with error "Error from processor: Corrupt OpenXML document. ErrorCode: 2028". User submitting the file is using Office 365. Other users on different versions of Excel do not experience the error.
Studio/Foundation 11+, Office 365
Studio uses Spreadsheet Gear, as does the AutoRun plugin. Currently Spreadsheet Gear only supports up to Patch 1803 for Office 365. User was on Patch 1903.
Downgrade Office to Patch 1803.