To get at the DLL you'll have to copy the DLL from the GAC into a development location (the GAC location is %windir%\assembly\GAC\LdapServices.LdapClient\4.0.0.0__a8ca917b5ce3c5de\*.dll).
Note that the Windows shell extension for the GAC prevents using Explorer to access this file. Instead you can use the command line:
cd \
md ldapclient.net
cd ldapclient.net
copy %windir%\assembly\GAC\LdapServices.LdapClient\4.0.0.0__a8ca917b5ce3c5de\*.dll
This experience will be improved in a future release.