TSZ file
From TrillWiki
A TSZ file is just a ZIP file renamed with the TSZ extension. This allows Trillian to set itself as the handler for those types of files to allow users to install skins more easily.
Trillian automatically expands the skin to skins\temp_skins_directory (for the default profile) or skins\temp_skins_directory[profilename] (for other profiles). The Configurator expands TSZ and ZIP files to skins\temp_skins_directory_TC[profilename]. This means that the root directory of the ZIP should be skins, with only the skin's directory (and subdirectories) included.
Since Trillian automatically expands the skin, TSZ files don't work well with having user-configurable settings since they may get overwritten the next time Trillian is started. (The Configurator's behavior is that if settings are made after a TSZ file is chosen, but before it is set as the current skin, then the changes will be written back into the TSZ itself, with a backup of the original made with TCRestore added to the name.)
