And clean up when disconnecting input.

Also removes dead code caused by the change.

The handle will be closed by free_custom_action_data, so duplicate the 
handle before calling it.

shell32/tests: On Windows 98 FindExecutable() does not '\0' terminate the returned command which caused many tests to fail.

shell32/tests: End the lines with CR+LF otherwise the profile APIs are unable to read them back on Win >= 2000.

Add comments indicating which Windows version returns a given error code.