pem vs crt

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Hi,

As mentioned:
"If your curl is built with OpenSSL, that CA bundle needs to be in PEM
format so curl can't use the operating systems' own CA store directly."
in https://curl.haxx.se/mail/curlphp-2016-09/0004.html

Does this mean if curl is built with OpenSSl, a .crt file like the one in '
/etc/pki/tls/certs/ca-bundle.crt' cannot be used instead of a .pem file,
and also it ignores all default server's .pem and .crt and only a .pem file
must be defined manually with CURLOPT_CAINFO?

Looking forward hearing back,
Thanks,

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<div dir=3D"ltr"><div><br></div><div>Hi,</div><div><br></div><div>As mentio=
ned: </div><div>&quot;If your curl is built with OpenSSL, that CA bundle ne=
eds to be in PEM format so curl can&#39;t use the operating systems&#39; ow=
n CA store directly.&quot; </div><div>in <a href=3D"https://curl.haxx.se/ma=
il/curlphp-2016-09/0004.html">https://curl.haxx.se/mail/curlphp-2016-09/000=
4.html</a><span><span><br></span></span></div><div><br></div><div>Does this=
 mean if curl is built with OpenSSl, a .crt file like the one in <span clas=
s=3D"gmail-pl-s"><span class=3D"gmail-pl-pds">&#39;</span>/etc/pki/tls/cert=
s/ca-bundle.crt<span class=3D"gmail-pl-pds">&#39; cannot be used instead of=
 a .pem file, and also it ignores all default server&#39;s .pem and .crt an=
d only a .pem file must be defined manually with CURLOPT_CAINFO?</span></sp=
an></div><div><span class=3D"gmail-pl-s"><span class=3D"gmail-pl-pds"><br><=
/span></span></div><div><span class=3D"gmail-pl-s"><span class=3D"gmail-pl-=
pds">Looking forward hearing back,</span></span></div><div><span class=3D"g=
mail-pl-s"><span class=3D"gmail-pl-pds">Thanks,</span></span></div><div><sp=
an class=3D"gmail-pl-s"><span class=3D"gmail-pl-pds"><br></span></span></di=
v></div>

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