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BootAble – FreeDOS boot testing freeware
To obtain direct, low-level access to a system's mass storage drives, SpinRite runs under a GRC-customized version of FreeDOS which has been modified to add compatibility with all file systems. In order to run SpinRite it must first be possible to boot FreeDOS.
GRC's “BootAble” freeware allows anyone to easily create BIOS-bootable media in order to workout and confirm the details of getting a machine to boot FreeDOS through a BIOS. Once the means of doing that has been determined, the media created by SpinRite can be booted and run in the same way.
The participants here, who have taken the time to share their knowledge and experience, their successes and some frustrations with booting their computers into FreeDOS, have created a valuable knowledgebase which will benefit everyone who follows.
You may click on the image to the right to obtain your own copy of BootAble. Then use the knowledge and experience documented here to boot your computer(s) into FreeDOS. And please do not hesitate to ask questions – nowhere else can better answers be found.
(You may permanently close this reminder with the 'X' in the upper right.)
Have you tried running it from a Command Window? e.g. D:/Validrive.exe
You win the prize!
Why didn't I think of that? 
Launching ValiDrive in a CMD window works. Didn't even have to open CMD, run as administrator.
But, I still get that Microsoft Store box when I try to launch the exact same .exe file by double-clicking it in the folder where it's stored. And -obviously- it doesn't launch that way.
Another in the never-ending series of Mysteries from Redmond...
Thanks!
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