* Each file is structured in a 4-level hierarchy structure to make folder navigation easier.

For example,
HRGMv2_20XX/                                ← Level 1 (group of 100s)
└── HRGMv2_204X                             ← Level 2 (group of 10s)
    └── HRGMv2_2040/                        ← Level 3 (group of 1s)
	        ├── GENOME008241.tar.gz         ← Level 4 (actual files)
		    └── ...