No orthodox file manager - sorry but that's epic proportions missing tool for the target audience: system technicians, not explorer drag&drop plebs. And how is that Hiren's anymore? Sounds.. indecent.
The original, true Hiren's Boot CD will never return as it did contain Warez. Then, it was cleaned but interest waned (surprise). There was an interim third-party "Restored" version (Proteus) that was a DVD. This new Win10PE version seems to be still in its infancy. It will be improved over time, but don't expect it to be like the old one.
You can add any manager you wish to the files. I have actually been using Sergei Strelec's WinPE 8 - 10 which is a much more complete boot option. This is two versions behind but is just to give a idea. ( Link Removed Warez )
It's pretty long to boot even with a fast USB key, but it's a good piece of software, it works well and is reliable.
Fully functional I have this tool right on a pendrive for startup options when systems fail to load. Also to explore computers where they have been damaged by viruses. For this and for all the variety that can be occupied. Great tool again.
Unfortunately the PE version don't have many things (E.g Partition Home Winzard, Smart HDD, and etc..) but nice, i have tested it and it works great, this version don't cause the blue screen of death (ACPI ) when starting Mini XP Helpful Tool kit CD or USB
Kyhi does fine work, but better mention the original developer that created the PE builder that it is based on: Win10XPE and/or Win10PESE, created by @chrisr.