windbg extension doesn't load

[s0i37]

Hello.
I compiled windbg extension like a:

cl /c outputcallback.cpp
cl /c sync.cpp
cl /c tunnel.cpp
link outputcallback.obj sync.obj tunnel.obj /out:sync.dll /dll advapi32.lib

Putted sync.dll into windbg\x86\winext\ folder

Loaded extension:
.load sync

Dll succesfully loaded (I can see it in procexp)

But I don't have any extensions:

!sync

[s0i37]

My mistake!
link outputcallback.obj sync.obj tunnel.obj /out:sync.dll /dll advapi32.lib /def:sync.def

Thanks a lot!