2017-11-17-105835.inProgress - a 407.08 GB Package - how to open

How do I open this file -  "2017-11-17-105835.inProgress"  - a 407.08 GB Package

This file was created when a Mac mini failed to start (stalled progress bar, no opening screen) with Time Machine HD connected. I connected this HD to another Mac to view folders.

If opened, How to retrieve files?
MARSPATHRetired EE/Computers/ITAsked:
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It's an incomplete file.  You can't really open it normally.  If you know what type of file it's supposed to be, you can partially open it.  If it's a TAR file you have the beginning data.  With zip, or rar type files files, you might be able to salvage a few files if the files were complete up to that point.  There's typically no standard way to work on the file unless you know what type of file it is.

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MARSPATHRetired EE/Computers/ITAuthor Commented:
I was concerned that would be true, however, I do have an Acronis 2013 full backup a couple of weeks older, but hopefully usable. I assume I can extract individual files to a different Mac mini - yes?
MARSPATHRetired EE/Computers/ITAuthor Commented:
A long shot, but I booted in recovery mode & back in business where I left off. Well done Apple!
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