Default file format: registry value defaultformat (powerpoint\options)UserHKCU\software\policies\microsoft\office\16.0\powerpoint\options

Policy ID: L_SavePowerPointfilesas
Scope: User Configuration
Supported on: At least Windows Server 2008 R2 or Windows 7
Source: Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category: Microsoft PowerPoint 2016 › PowerPoint Options › Save

Registry

defaultformat

REG_DWORDUser

HKCU\software\policies\microsoft\office\16.0\powerpoint\options Current key

Enabled value: Depends on the option value
Element: Save PowerPoint files as

Options
Item	Stored value
PowerPoint Presentation (*.pptx)	27
PowerPoint Macro-Enabled Presentation (*.pptm)	28
PowerPoint 97-2003 Presentation (*.ppt)	0
OpenDocument Presentation (*.odp)	52

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\powerpoint\options]

; Options (use only one)
; PowerPoint Presentation (*.pptx)
"defaultformat"=dword:0000001b
; PowerPoint Macro-Enabled Presentation (*.pptm)
"defaultformat"=dword:0000001c
; PowerPoint 97-2003 Presentation (*.ppt)
"defaultformat"=dword:00000000
; OpenDocument Presentation (*.odp)
"defaultformat"=dword:00000034

CMD

:: Options (use only one)

:: PowerPoint Presentation (*.pptx)
reg add "HKCU\software\policies\microsoft\office\16.0\powerpoint\options" /v "defaultformat" /t REG_DWORD /d 27 /f
:: PowerPoint Macro-Enabled Presentation (*.pptm)
reg add "HKCU\software\policies\microsoft\office\16.0\powerpoint\options" /v "defaultformat" /t REG_DWORD /d 28 /f
:: PowerPoint 97-2003 Presentation (*.ppt)
reg add "HKCU\software\policies\microsoft\office\16.0\powerpoint\options" /v "defaultformat" /t REG_DWORD /d 0 /f
:: OpenDocument Presentation (*.odp)
reg add "HKCU\software\policies\microsoft\office\16.0\powerpoint\options" /v "defaultformat" /t REG_DWORD /d 52 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\powerpoint\options' -Force | Out-Null

# Options (use only one)
# PowerPoint Presentation (*.pptx)
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\powerpoint\options' -Name 'defaultformat' -PropertyType DWord -Value 27 -Force | Out-Null
# PowerPoint Macro-Enabled Presentation (*.pptm)
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\powerpoint\options' -Name 'defaultformat' -PropertyType DWord -Value 28 -Force | Out-Null
# PowerPoint 97-2003 Presentation (*.ppt)
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\powerpoint\options' -Name 'defaultformat' -PropertyType DWord -Value 0 -Force | Out-Null
# OpenDocument Presentation (*.odp)
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\powerpoint\options' -Name 'defaultformat' -PropertyType DWord -Value 52 -Force | Out-Null