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#2325 - Throws NotSupportedException if opening workbook saved in Strict OpenXML format#2327

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bug/i2325v2
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#2325 - Throws NotSupportedException if opening workbook saved in Strict OpenXML format#2327
swmal wants to merge 1 commit intodevelop8from
bug/i2325v2

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@swmal swmal commented Apr 8, 2026

EPPlus does not support Strict Open XML. Previously it failed quietly - as in #2325 where the ExcelWorkbook returned 0 worksheets. With this PR EPPlus will throw a NotSupportedException when loading a Strict Open XML workbook.

@swmal swmal self-assigned this Apr 8, 2026
@swmal swmal added the enhancement New feature or request label Apr 8, 2026
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