In the file name the "nts" part is short for "not thread safe".
NTS versions of php extensions are built to run as CGI/FastCGI processes under PHP.
TS/Thread Safe versions are built to run under a process that creates many threads: for PHP running as a Apache module.
http://sourceforge.net/projects/wincache/files/I don't see any thread safe versions which kind of makes sense since WinCache was developed to be used by IIS which runs PHP as FastCGI by preference.
You'd probably have to build WinCache yourself to get the TS version and even then it might not work very well.