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PEM, PKCS7, and PKCS12 format files can contain multiple certificates. This is useful for storing a bundle of the root certificates of the CAs you trust, a certificate verification chain, or a complete endpoint identity within a single file.

Cer just stands for certificate. It is normally DER encoded data, but Windows may also accept PEM encoded data. You need to take a look at the content (e.g. using the file utility on posix systems) to see what is within the file to be 100% sure.

How to Install Root and Intermediate Certificates Click the Start Button then select Run and type mmc. Click File and select Add/Remove Snap in. Select Add, select Certificates from the Add Standalone Snap-in box and click Add. Select Computer Account and click Finish (note: This step is very important.

Step 1: Go to this CA bundle resource page. Step 2: Choose the SSL certificate you have purchased (or its closest match) from the list. Step 3: To start the CA bundle CRT download process, simply press the download icon under the SHA-2 CA Download column.

How do I make my own bundle file from CRT files? Open All files in a text editor. (Remember, not your domain certificate.) Create a new blank text file. Copy contents of all files in reverse order and paste them into the new file.Save newly created file as 'yourDomain.

Crt keeps a signed certificate, whereas . csr is the certificate signing request. Also, . pem just indicates that the content (can be a key, certificate,) is Base64 encoded.

To combine them, simply copy the contents inside of the root certificate and paste it into a new line at the bottom of the intermediate certificate file. Once this is done, click File -> Save As and save this new bundle file and ensure to add '. crt' without the quotes at the end of the new filename.