How to get .CRT file

Can any one guide me how to create the .CRT file .cer 

I got my .cer file from verisign. I read somewhere
copy .cer to .CRT works, but i am cheking my current
working system where .CRT is different than .CER

I am using openssl on AIX 5.1

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Thanks, 

Sambit Nanda 
203-553-3424 (O)

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