.cer (Canonical Encoding Rules / Distinguished Encoding Rules format)
Windows comes with a pre-installed list of trusted root certificates (via Microsoft Update). The Microsoft Root Certificate Authority 2011 is included in every modern Windows release (8, 8.1, 10, 11, Server 2012+). Your OS trusts it . microsoft root certificate authority 2011cer work
The root certificate signs intermediate certificates, such as the Microsoft Code Signing PCA 2011 or Microsoft Windows Production PCA 2011 . microsoft root certificate authority 2011cer work