Where are private keys are stored on my Windows system? I want to know where are my private keys created with the "makecert.exe" command

Private keys are stored in Private Key Containers on Windows systems. Private Key Containers are system binary files located in your home folder as shown below:

C:\fyicenter>dir /as /od
C:\users\fyicenter\AppData\Roaming\Microsoft\Crypto\RSA\S-1-5-22-60216235...

01/02/2012  12:01 AM      45 73aa4cc77f591dfc2374580bbd95f6ba_e...
01/03/2012  12:01 AM      53 6c29ae44e85efac3c72ff4d1865d73f1_e...
01/04/2012  01:53 AM   2,091 6b73f34a514de86f5cb606c50cf09a9d_e...
01/05/2012  01:19 AM      62 1731aebd11d9b32a88454ba0f0141493_e...
01/06/2012  03:54 AM      77 0077ead69703e3bf1fd373a3c9376faa_e...
02/31/2012  02:16 AM      47 acfeeb88387f62fa12bbe68a810bffa3_e...
04/06/2012  11:19 PM     921 d993c5b748d1779d01850cea6b39271e_e...
07/01/2012  09:08 PM   1,286 5da774fef392bc623eb146006db1f2bd_e...
07/04/2012  09:28 PM   1,276 6b90a71bfc56f2582e916a51aed6df9a_e...

The latest file in this list should be the private key container created by the "makecert.exe" command to hold the private key for "Fred Dews" certificate.

⇒ "makecert.exe -sk" - Specify Private Key Container

⇐ "makecert.exe -n" - Create Test Certificate File

⇑ Certificate Generation Tool "makecrt.exe" on Windows

⇑⇑ Windows Certificates Tutorials