Information
File validation in PowerPoint must be enabled.
GROUP ID: V-223382
RULE ID: SV-223382r961092
This policy setting allows you to turn off the file validation feature. If you enable this policy setting, file validation will be turned off. If you disable or do not configure this policy setting, file validation will be turned on. Office Binary Documents (97-2003) are checked to see if they conform against the file format schema before they are opened.
Solution
Set the policy value for
User Configuration >> Administrative Templates >> Microsoft PowerPoint 2016 >> PowerPoint Options >> Security 'Turn off file validation'
to 'Disabled'.