: Represents the start date in YYMMDD format (June 8, 2021). 210615 : Represents the end date (June 15, 2021).
If you are looking for a description to accompany this file, you might use: File: DoubleP_210608-210615.zip ...
: A compressed folder containing multiple files to save space and keep them together. : Represents the start date in YYMMDD format (June 8, 2021)
This filename appears to be an archive of project or transaction data spanning from June 8, 2021, to June 15, 2021. to June 15
Based on standard naming conventions, here is how the text breaks down: