In CS 1.6, the server master file "MasterServers.vdf" should be installed into <cs_1.6_install_path>\platform\config, for non-steam clients. Yet, I have found a Red&Black 2014 (powered by tinzo) release in which "MasterServers.vdf" is installed into "C:\Program Files (x86)\Counter-Strike 1.6 Red&Black\config", instead of "C:\Program Files (x86)\Counter-Strike 1.6 Red&Black\platform\config".
In this case, is the server browser still using the setti master file "MasterServers.vdf"?
And, in the non-steam 1.6 client, which application is using the file "MasterServers.vdf"?
Really have no idea on this...