: Likely the project initials or subject matter (e.g., "Middle School Music Resources - English Language Arts" or a similar internal identifier).
: The file format, which is a Roshal Archive used for data compression. GF190822-MSMR-ELA.part10.rar
Archive Part 10 of the GF190822-MSMR-ELA data set, released/indexed on August 22, 2019. : Likely the project initials or subject matter (e