DER file for OPC UA S4F Master (part of Schneider Electric Device Genuineness PKI)
This a X509 certificate file, using DER format (binary). You can convert it in PEM format using openssl for example openssl x509 -inform der -in "certificate".cer -out "certificate".pemIt's part of "Schneider Electric OPC UA Root CA" hierarchy. All certificates are published on this website.