The local store is used to hold items that are required for certificate validation. Depending on your configuration, this may include trusted root certificates, intermediate certificates, and/or Certificate Revocation Lists (CRLs).
The default local store is:
You can add folders or files. When you add a folder, all the contents of the folder, including subfolders, are included in your store. Files must be binary or base 64 encoded X.509 certificates or CRLs.