Mon Dec 11 2017 05:58:34 UTC
If there's anything to blame, it's the lack of unit tests.
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10 bugs found.
ID Product Comp Assignee Status Resolution Summary Changed
3354 Class Li WindowsB bugzilla NEW --- System.IO.Packaging throws NullReferenceException 2012-06-10
14714 Class Li WindowsB bugzilla NEW --- XamlServices.Load throws XamlParseException if a member name equals a type name 2013-09-13
361 Class Li WindowsB bugzilla NEW --- minizip as used by System.IO.Packaging is not 64bit safe 2014-02-12
20754 Class Li WindowsB bugzilla NEW --- System.IO.Packaging, invalid time format in PackagePropertiesPart.cs when using OpenXML SDK 2.5 2014-06-20
31138 Class Li WindowsB bugzilla NEW --- when open a xlsx file,occur a exception "Operation not valid when package is read-only" 2015-06-16
34414 Class Li WindowsB bugzilla NEW --- System.IO.Packaging problem with readonly files 2015-09-29
6602 Class Li WindowsB bugzilla NEW --- PackagePart.LoadRelationships makes relative PakcageRelationship target uris absolute 2015-09-29
5437 Class Li WindowsB bugzilla NEW --- WindowsBase needs to track cross-asssembly API changes for some ValueSerializer 2016-11-11
31347 Class Li WindowsB bugzilla NEW --- System.IO.Packaging.Package broken for packages with many files. 2017-02-17
54804 Class Li WindowsB bugzilla CONF --- ZipPackage uses Default instead of Override for files with no extension in [Content_Types].xml 2017-10-06
10 bugs found.

as

File a new bug in the "WindowsBase" component of the "Class Libraries" product