Quote from: Boss3010 on Today at 02:05:58 AM

Now I am trying to find it in my old hard disk

1. Have you made RAW copy/backup of your old hard drive? It's important to prevent any deleted data accidentally overwritten.
2. Have you tried using file recovery software to look for any deleted data?

Quote from: Boss3010 on Today at 02:05:58 AM

I analyzed the file and found the encrypted date is 6000 bits

You need to explain this part better, since 6000 bits probably refer to length of RSA keys or size of encrypted data rather than date.

Quote from: Boss3010 on Today at 02:05:58 AM

and I need a private rsa key with specific id key and my file is 165 MB

165MB file? What kind of file you're talking about? I'm sure Bitcoin-qt and wallet file generated by Bitcoin-qt have smaller size.