Opening/viewing iCal in Windows I have this one condition:

The boss is using mac, the secretary is using PC. The boss keep all the schedules in iCal,  and now the secretary cannot manage and see the schedules because i dont know how to open or view iCal in Windows.

Is there any third party software that can do this?
You can try Moo Calendar, it supports iCalendar format. If you have a Google Calendar account, you can use it to sync calendar with Google Calendar.