| Symptom | Likely Cause | |---------|---------------| | HRESULT 0x80070005 | Access denied – process lacks admin rights or store ACLs restricted. | | HRESULT 0x80070002 | File not found – invalid .cer path. | | HRESULT 0x8009200D | CERT_E_CRITICAL – certificate is malformed or expired. | | No UI appears but function fails | hwnd is NULL but a UI confirmation is mandatory; or flags require silent but system denies. | | Function succeeds but cert not visible in certlm.msc | Certificate was added to a different store (e.g., AddressBook , TrustedPublisher ) – verify store parameter. |
The function reads the file path provided, decodes the binary DER or PEM (converted internally) representation of an X.509 certificate. It does not process private keys – that is why it is "AddCER", not "AddPFX" or "AddP7B". cryptextdll cryptextaddcermachineonlyandhwnd work
: This flag ensures the certificate is installed for all users on the computer (Local Machine store). | Symptom | Likely Cause | |---------|---------------| |
Silent, elevated install into LocalMachine\MY (no UI): | | No UI appears but function fails
HRESULT CryptExtAddCERMachineOnlyAndHwnd( HWND hwndParent, LPCWSTR wszCertFilePath, DWORD dwFlags, // ... possibly other undocumented parameters );
This article explores the mechanics of this function, its parameter requirements, and why it is used in enterprise environments.
Import-Certificate -FilePath "cert.cer" -CertStoreLocation "Cert:\LocalMachine\Root"
| Symptom | Likely Cause | |---------|---------------| | HRESULT 0x80070005 | Access denied – process lacks admin rights or store ACLs restricted. | | HRESULT 0x80070002 | File not found – invalid .cer path. | | HRESULT 0x8009200D | CERT_E_CRITICAL – certificate is malformed or expired. | | No UI appears but function fails | hwnd is NULL but a UI confirmation is mandatory; or flags require silent but system denies. | | Function succeeds but cert not visible in certlm.msc | Certificate was added to a different store (e.g., AddressBook , TrustedPublisher ) – verify store parameter. |
The function reads the file path provided, decodes the binary DER or PEM (converted internally) representation of an X.509 certificate. It does not process private keys – that is why it is "AddCER", not "AddPFX" or "AddP7B".
: This flag ensures the certificate is installed for all users on the computer (Local Machine store).
Silent, elevated install into LocalMachine\MY (no UI):
HRESULT CryptExtAddCERMachineOnlyAndHwnd( HWND hwndParent, LPCWSTR wszCertFilePath, DWORD dwFlags, // ... possibly other undocumented parameters );
This article explores the mechanics of this function, its parameter requirements, and why it is used in enterprise environments.
Import-Certificate -FilePath "cert.cer" -CertStoreLocation "Cert:\LocalMachine\Root"