IrfanView

Version documented: 4.66 Installer type: .exe (custom NSIS) Hives written: HKCU, HKLM, HKCR

📁 Registry Paths

Path	Hive	Purpose
`SOFTWARE\IrfanView`	HKCU	User settings and preferences
`SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\IrfanView`	HKLM	Uninstall entry
`HKCR\.jpg\OpenWithProgIds\IrfanView.jpg`	HKCR	.jpg association
`HKCR\.png\OpenWithProgIds\IrfanView.png`	HKCR	.png association
`HKCR\.bmp\OpenWithProgIds\IrfanView.bmp`	HKCR	.bmp association
`HKCR\IrfanView.jpg`	HKCR	ProgID for JPEG

🔑 Keys

HKCU\SOFTWARE\IrfanView

Value Name	Type	Example Data	Description
`Directory`	REG_SZ	`C:\Program Files\IrfanView`	Install directory
`Language`	REG_SZ	`English`	UI language
`CheckForUpdates`	REG_DWORD	`1`	Check for updates at start
`FitToDesktop`	REG_DWORD	`0`	Fit large images to window
`ShowScrollbars`	REG_DWORD	`1`	Show scrollbars
`SlideShowInterval`	REG_DWORD	`3`	Slideshow interval (seconds)

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\IrfanView

Value Name	Type	Example Data	Description
`DisplayName`	REG_SZ	`IrfanView 4.66 (64-bit)`	Display name
`DisplayVersion`	REG_SZ	`4.66`	Version
`Publisher`	REG_SZ	`Irfan Skiljan`	Publisher
`InstallLocation`	REG_SZ	`C:\Program Files\IrfanView`	Install path
`UninstallString`	REG_SZ	`"iv_uninstall.exe"`	Uninstaller

HKCR\IrfanView.jpg

Value Name	Type	Example Data	Description
`(Default)`	REG_SZ	`JPEG Image`	Friendly type name
`shell\open\command` (Default)	REG_SZ	`"i_view64.exe" "%1"`	Open command

📝 Notes

IrfanView registers associations for a large number of formats: .jpg, .jpeg, .png, .bmp, .gif, .tif, .tga, .ico, .webp, .heic, and more (dependent on plugins installed).
Plugins extend format support and are tracked separately in HKCU\SOFTWARE\IrfanView\Plugins.
Settings are also stored in i_view64.ini in the install directory; registry and INI are kept in sync.

# Check configured install directory
(Get-ItemProperty "HKCU:\SOFTWARE\IrfanView" -ErrorAction SilentlyContinue).Directory

# Export full settings for migration
reg export "HKCU\SOFTWARE\IrfanView" "$env:USERPROFILE\irfanview-settings.reg"

🗑️ Cleanup

# Remove IrfanView user settings
Remove-Item -Path "HKCU:\SOFTWARE\IrfanView" -Recurse -ErrorAction SilentlyContinue

# Remove key image file associations
foreach ($ext in @('.jpg','.jpeg','.png','.bmp','.gif','.tif','.tga','.ico','.webp')) {
    Remove-ItemProperty "HKCR:\$ext\OpenWithProgIds" -Name "IrfanView$ext" -ErrorAction SilentlyContinue
}
Remove-Item -Path "HKCR:\IrfanView.jpg" -Recurse -ErrorAction SilentlyContinue

📦 Package Managers

Manager	ID / Command
winget	`winget install IrfanSkiljan.IrfanView`
Chocolatey	`choco install irfanview`
Scoop	`scoop install extras/irfanview`