Sumatra PDF

Version documented: 3.5.2 Installer type: .exe (NSIS) / Portable Hives written: HKCU, HKLM, HKCR

📁 Registry Paths

Path	Hive	Purpose
`SOFTWARE\SumatraPDF`	HKCU	User preferences and state
`SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SumatraPDF`	HKLM	Uninstall entry
`HKCR\.pdf\OpenWithProgIds\SumatraPDF`	HKCR	.pdf file association
`HKCR\SumatraPDF`	HKCR	ProgID definition
`HKCR\.epub\OpenWithProgIds\SumatraPDF`	HKCR	.epub association
`HKCR\.cbz\OpenWithProgIds\SumatraPDF`	HKCR	.cbz (comic book) association

🔑 Keys

HKCU\SOFTWARE\SumatraPDF

Value Name	Type	Example Data	Description
`Window_DX`	REG_DWORD	`1200`	Window width in pixels
`Window_DY`	REG_DWORD	`900`	Window height in pixels
`Window_X`	REG_DWORD	`100`	Window left position
`Window_Y`	REG_DWORD	`50`	Window top position
`ShowToolbar`	REG_DWORD	`1`	Toolbar visible (1=yes)
`DefaultDisplayMode`	REG_SZ	`single page`	Display mode
`DefaultZoom`	REG_SZ	`fit page`	Default zoom level
`RememberStatePerDocument`	REG_DWORD	`1`	Remember per-file zoom/page
`CheckForUpdates`	REG_DWORD	`1`	Auto-update check

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SumatraPDF

Value Name	Type	Example Data	Description
`DisplayName`	REG_SZ	`SumatraPDF`	Display name
`DisplayVersion`	REG_SZ	`3.5.2`	Version
`Publisher`	REG_SZ	`Krzysztof Kowalczyk`	Publisher
`InstallLocation`	REG_SZ	`C:\Program Files\SumatraPDF`	Install path
`UninstallString`	REG_SZ	`"...\uninstall.exe"`	Uninstaller

HKCR\SumatraPDF

Value Name	Type	Example Data	Description
`(Default)`	REG_SZ	`PDF Document`	Friendly type name
`shell\open\command` (Default)	REG_SZ	`"SumatraPDF.exe" "%1"`	Open command

📝 Notes

Sumatra PDF registers associations for: .pdf, .epub, .mobi, .cbz, .cbr, .djvu, .xps, .oxps.
The portable version writes no registry keys; preferences are stored in SumatraPDF-settings.txt alongside the .exe.
The -set-color-range and other CLI flags can set preferences without writing to the registry.

# Check if SumatraPDF is the default PDF handler
(Get-ItemProperty "HKCR:\.pdf" -ErrorAction SilentlyContinue).'(Default)'

# Export window/zoom preferences for migration
reg export "HKCU\SOFTWARE\SumatraPDF" "$env:USERPROFILE\sumatrapdf-settings.reg"

🗑️ Cleanup

# Remove SumatraPDF user preferences
Remove-Item -Path "HKCU:\SOFTWARE\SumatraPDF" -Recurse -ErrorAction SilentlyContinue

# Remove file associations
foreach ($ext in @('.pdf','.epub','.mobi','.cbz','.cbr','.djvu','.xps')) {
    Remove-ItemProperty "HKCR:\$ext\OpenWithProgIds" -Name "SumatraPDF" -ErrorAction SilentlyContinue
}
Remove-Item -Path "HKCR:\SumatraPDF" -Recurse -ErrorAction SilentlyContinue

📦 Package Managers

Manager	ID / Command
winget	`winget install SumatraPDF.SumatraPDF`
Chocolatey	`choco install sumatrapdf`
Scoop	`scoop install extras/sumatrapdf`