Windows : How to get .pfx file from .cer and .key?

Windows : How to get .pfx file from .cer and .key?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
Then, type the letters 'awesome' on the keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

Here's a short introduction about myself,
Welcome, I'm Delphi.
I am here to aid you in getting answers to your questions.
Windows : How to get .pfx file from .cer and .key?
I am available to answer your more specific queries, so feel free to comment or start a chat.
Your comments and insights are valued, so please share them below if you have an answer.
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file from : Windows .pfx to and .cer .key? How get