registrykey - x++ cannot read registry entry -

i have problem reading registry entry in x++.

i'm trying find install directory of helpserver. i'm working client on same computer of aos , server.

the key hkey_local_machine\software\microsoft\dynamics\6.0\setup\helpserver , property installdir.

when try read node, system returns no handle:

winapi::regopenkey(#hkey_local_machine, @'software\microsoft\dynamics\6.0\setup\helpserver', #key_read);) 

if try read key hkey_local_machine\software\microsoft\dynamics\6.0\setup has property same name of above, can read value without problem.