Hi there
wow, this is really a tough one for sure

As the context in some what ambiguous and this ARO term is not so popular but there is at least three possible candidates


aro : ArtRealOs
وثيقة جدول معدلات نظام تشغيل الذكاء الإصطناعي
http://sourceforge.net/projects/artrealos/


aro registery program
وثيقة جدول معدلات برنامج أرو لتحسين سجلات الريجستيري
http://www.techspot.com/downloads/5277-aro.html
http://www.sammsoft.com/Aro2013.aspx


aro : Application Resource Optimizer
وثيقة جدول معدلات مُحسن أسناد موارد النظام للبرامج
http://www.acronymfinder.com/ARO.html
http://en.wikipedia.org/wiki/Shared_resource
http://www.research.att.com/projects/ARO/index.html?fbid=HJh...
https://developer.att.com/home/develop/ARO/ARO_UserGuide_1_4...

i admit that the rendering may be not 100% accurate or strong but this is really not very clear text

hopefully that has been helpful
GL