Does is still work, or have any effect?
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According to Microsoft from Vista onward the following registry key exists:
KeepAliveTime
Key: Tcpip\Parameters
Value Type: REG_DWORD—time in milliseconds
Valid Range: 0–0xFFFFFFFE
Default: 7,200,000 (two hours)
Description: This value controls how often TCP attempts to verify that an idle connection is still intact by sending a keep-alive packet. If the remote system is still reachable and functioning, it acknowledges the keep-alive transmission. Keep-alive packets are not sent by default. This feature may be enabled on a connection by an application.
There is also this Technet blog called ‘Things that you may want to know about TCP Keepalives’ that discusses it further.