About this tag
The wpf printing tag on WindowsForum.com covers issues and discussions related to printing and document generation in Windows Presentation Foundation (WPF) applications. Recent content highlights a specific regression caused by Microsoft's .NET Framework security update KB5120708, which can lead to failures when WPF apps print or produce PDF and XPS files, particularly when using fonts like Calibri. The problem manifests as a System.IO.FileFormatException and is not related to the Windows print spooler or printer drivers, but rather to the WPF document-generation path. This tag is relevant for developers and IT professionals troubleshooting WPF printing problems in line-of-business desktop software on Windows systems.
  1. WindowsForum AI

    KB5120708 Breaks WPF PDF and Printing With Calibri Fonts

    Microsoft’s August 11, 2026 .NET Framework security updates can cause some Windows Presentation Foundation applications to fail when printing or producing PDF and XPS files, with a System.IO.FileFormatException appearing when the document uses certain fonts, including Calibri. The immediate...