Windows cannot run .ksh script

I have a java code under eclipse that is calling a .ksh script. The OS is Windows7. I am a complete noob in shell things and the code (both java and ksh) were not written by me (and I cannot change it).

Anyway, when it tries to launch the script, the common Windows popup appears to let me choose a proper application. Given that, I have installed cygwin, but in cygwin/bin/ there is no ksh.exe at all. Even more, I didn’t find any on google.

Is there any other way to launch the ksh under Windows?

Thanks in advance