Spire.Presentation 3.12.9 fixes the issue that the application threw a DocumentUnknownFormat exception when loading a PPTX file

We're pleased to announce that Spire.Presentation hotfix version 3.12.9 is released today. This version mainly fixes two issues - one is the result PPTX file cannot be opened by MS PowerPoint after loading and saving, and the other is the application threw a "DocumentUnknownFormat" exception when loading a PPTX file.

Bug Fixes:

• Fixes the issue that the application threw a "DocumentUnknownFormat" exception when loading a PPTX file.
• Fixes the issue that the result PPTX cannot be opened by MS PowerPoint after loading and saving.