Got our file from a CA (Go-Daddy). Noticed there are two .crt files inside the zip file.

1. host.mydomain.crt
2. gd_bundle.crt

do I need to combine these files into one or do I just use the first (mydomain.crt).
Also, how do I convert this to a PEM file, is it simply renaming it from .crt to .pem?