Resolved: blank.pptm and blank.potm support "PowerPoint can't open this file because its file extension has changed. Make sure the format of the file matches the file extension."

Situation:

  • A marcro-enabled presentation (.pptm) was published as "Master" with SlideProof

Complication:

  • Clicking on "Default Template" in the PowerPoint backstage produces the following error message
"PowerPoint can't open this file because its file extension has changed. Make sure the format of the file matches the file extension."

Intermediate Solution:

  • Open the "Blank Presentation" Template
  • Open the file via SlideProof > Library > Masters > double click on the Master
  • Optionally: rename blank.pptm to something other then blank and re-publish (SlideProof > Publish > Master)

Permanent:

  •  Work with SlideProof 3.3.7.16577 or higher

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