Managed-Zlib
The UO network protocol and file loading system use various zlib compression methods. These are generally provided by your OS, but TazUO now always uses its built-in managed zlib implementation.
Previously a native zlib.dll was shipped alongside the client, which could cause crashes on startup when it was missing or mismatched. The native library is no longer shipped and the built-in managed implementation is always used, which also improves UNIX/Linux compatibility.
Because it is no longer a choice, the Force using a managed zlib option and the -zlib launch argument were removed.