From Team Developer SqlWindows Wiki
TD C-API archive
Every TD development installation comes with a set of header (.h) and library (.lib) files
which are used to utilize the TD runtime environment from within C projects.
The TD C-API archive contains for each TD version the official set of files which are deployed with that TD version.
Having this archive it is not needed to install the TD IDE on your system to get those files.
The archive will be updated with the files from the latest TD version when it is available.