Hello arpeggiatorman,
the specs for the arp format is rather complex and complicated. Please do note that data contained within the .arp files is copyrighthed material which is intelectual property of the sound designers. If you are a developer who wants to create a 3rd party support tool feel free to contact us by email and we'll try to be as helpful as possible.
So far noone else has requested the possibility to see which .arp file is currently loaded. We'll examine if it's possible to include this feature to Saurus v1.2.
Best Regards,
Markus