HashCheck Shell Extension

Version: 2.4.0
Installer: .exe (setup)
Hives: HKCU, HKLM, HKCR

HashCheck adds a Checksums tab to the Windows Explorer file Properties dialog, allowing verification of MD5, SHA-1, SHA-256, and CRC32 hashes without any separate application.

📁 Registry Paths

Path	Hive	Description
`SOFTWARE\HashCheck`	HKCU	Per-user preferences
`SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\HashCheck`	HKLM	Uninstall entry
`CLSID\{B8F7B5E0-1A2C-4B8A-8FE3-A2D3B9C7E6F4}`	HKCR	COM class registration for the shell extension
`*\shellex\PropertySheetHandlers\HashCheck`	HKCR	Registers the Properties tab for all file types

🔑 Keys

HKCU\SOFTWARE\HashCheck

Value Name	Type	Example Data	Description
`Checksum`	`REG_DWORD`	`2`	Default hash algorithm (0=MD5, 1=SHA1, 2=SHA256)

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\HashCheck

Value Name	Type	Example Data	Description
`DisplayName`	`REG_SZ`	`HashCheck Shell Extension`	Display name
`DisplayVersion`	`REG_SZ`	`2.4.0`	Installed version
`Publisher`	`REG_SZ`	`Christopher Gurnee`	Publisher
`InstallLocation`	`REG_SZ`	`C:\Program Files\HashCheck\`	Install directory
`UninstallString`	`REG_SZ`	`"C:\Program Files\HashCheck\uninstall.exe"`	Uninstall command

HKCR*\shellex\PropertySheetHandlers\HashCheck

Value Name	Type	Example Data	Description
`(Default)`	`REG_SZ`	`{B8F7B5E0-1A2C-4B8A-8FE3-A2D3B9C7E6F4}`	CLSID of the shell extension COM object

📝 Notes

HashCheck registers as a shell property sheet handler — it appears as a tab in the file Properties dialog for ALL file types.
The COM object is registered in both HKCU\SOFTWARE\Classes\CLSID\ and HKCR\CLSID\ depending on whether it was installed per-user or machine-wide.
To disable the Properties tab without uninstalling, rename the HashCheck value under *\shellex\PropertySheetHandlers\.
The 64-bit build is required on 64-bit Windows to show in Explorer (32-bit shell extensions don't load in 64-bit Explorer).

🗑️ Cleanup

Windows Registry Editor Version 5.00

[-HKEY_CURRENT_USER\SOFTWARE\HashCheck]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\HashCheck]
[-HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\HashCheck]

Run the uninstaller to also remove the CLSID registration.

📦 Package Managers

Manager	Install Command
winget	`winget install gurnec.HashCheck`
Chocolatey	`choco install hashcheck`
Scoop	`scoop install hashcheck`