Mimikatz
Optionally look in the store
Run "mmc" and add the "certificates" snapin (<ctrl>-m). The network certificates are stored under "Certificates - Current User -> Personal -> Certificates".
Run inside console with admin rights
mimikatz # crypto::capi
Local CryptoAPI patched
mimikatz # privilege::debug
Privilege '20' OK
mimikatz # crypto::certificates /systemstore:current_user /store:my /export