My client have bought the comodo certificate twice but we lost the private key.

Digital Certificates Code Signing Certificate
1

Hi,

My client have bought the comodo certificate twice but we lost the private key. I would like to backup as .pfx file.

First time, he bought for the previous developer, he has gone!

I have got only 4 files.

00CE7DA87FACF3C5F382765FA9BDDAA48C.crt
AddTrustExternalCARoot.crt
COMODORSAAddTrustCA.crt
COMODORSACodeSigningCA.crt

Is it possible to convert these file to .pfx for Microsoft technologies?

I don’t see the certificate.
https://support.comodo.com/index.php?/Default/Knowledgebase/Article/View/1004/66/export-certificates-windows

Thanks
Weera