This specific function name indicates a targeted action for certificate management:
Download Cryptext.dll and Troubleshoot DLL Errors - EXE Files cryptextdll cryptextaddcermachineonlyandhwnd work
From binary analysis (Windows 10 cryptext.dll exports), CryptExtAddCERHwnd is actually a . It likely creates a modal dialog box that allows the user to choose the target store interactively and then adds the certificate. This specific function name indicates a targeted action
Automated Malware Analysis Report for root.cer - Joe Sandbox it may resemble:
This Dynamic Link Library (DLL) file is primarily used by the Windows operating system to handle cryptographic functions within the Windows Explorer shell. Typically found in C:\Windows\System32 .
Or in some tooling observations, it may resemble: