1. Create a text file and name it for example RequestPolicy.inf.
2. Copy/paste the following text to the file:

   [Version]
    Signature="$Windows NT$"
   
   [NewRequest]
    Subject = "CN=myserver.mycompany.com"
    KeyLength = 2048
    KeySpec = 1
    KeyUsage = 0xA0
    ProviderName = "Microsoft RSA SChannel Cryptographic Provider"
    RequestType = PKCS10
    FriendlyName = "My application"
   
   [EnhancedKeyUsageExtension]
    OID=1.3.6.1.5.5.7.3.1 ; Server Authentication
    OID=1.3.6.1.5.5.7.3.2 ; Client Authentication

3. Adapt the file content according to your needs.
   Typically you must at least:
   • Update the Subject
   • Update the FriendlyName
     

   Additionally you may also:

   • Add SAN elements
   • Configure the private key as exportable

More about the policy file’s syntax.

Note:
For improved security, it is recommended to remove unneeded capabilities.
For example, if only client authentication is needed, remove server authentication.