No. There is no cron.php file. The developer's instructions say to point it to jobs/cron. There are two files in the jobs/libraries with cron in the file name and I tried those but they didn't work either. Here is what I asked the developer and his response:
it should be /jobs/cron, i will add a sample to the manual soon.
What he does say in the current manual is
"Because of different administration software installed on different servers I cannot describe here setting a CRON job, however I can give you a URL which CRON has to visit.
Again assuming you have a WPJobBoard running in jobs directory in the main folder, the notification script can be reached at:
"The cron page should be accessed only by cron daemon - real users should not go there."
The plugin is WPJobBoard at http://wpjobboard.net/