[SOLVED (see answer below)] I am using SpreadsheetWorker API to make working with Open XML SDK 2.0 easier. I have an excel spreadsheet that I use as a template when I generate new excel spreadsheets through SpreadsheetWorker. I am getting a “found unreadable content” error when I open my generated files, and excel will correct the problems with the file if you allow it. This is not suitable for production.
[SOLVED (see answer below)] I am using SpreadsheetWorker API to make working with Open
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Solved my own question: In my excel spreadsheet that I used as a template, I had some blank cells with ‘Hyperlink’ styles applied to them. Setting the style of these cells to ‘Normal’ fixed the problem, and I no longer get the “unreadable content” error when I open generated spreadsheets for the first time.