Is there a way (presumably via a 3rd party app) that I can set a particular text file to open at a set time, i.e. something I need to read on a daily basis can be set to load at 6.03 after the alarm has finished going off?
You should be able to do this through an app called Tasker. Check out Useful or cool Tasker recipes, you may be able to modify one of those scripts to do what you want.
You could also use alarm clock plus, it allows you to set an app to launch when the alarm goes off. http://www.appbrain.com/app/alarm-clock-plusv2%E2%98%85/com.vp.alarmClockPlusDock