FAQ

Open *.pem with Crypto Shell Extensions
Write the following to a pem-as-cert.reg file:
```
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\.pem]
@="CERFile"
"Content Type"="application/x-x509-ca-cert"
```
Double click on it and then you have .pem linked to Crypto Shell extension. Source