EFS files and dirs on Win10

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Short question: how would a very low-knowledge user manage to create an encrypted file,
or, about 500+ of them?

Long explanation: I upgraded hardware and downgraded OS on wife's worker's PC (was Win10 now Win7).
Everything the gal does is either on her Desktop or in a Dropbox folder.
Found out Monday she "couldn't do her work" because "my files won't open, they all have the extension .PFILE on them".

She definitely is low-knowledge. So, how could she possibly have figured out how to encrypt an individual file? (It's right-click on file, Properties, Advanced, check box that says Encrypt contents to secure data).
Is there some spam-freeware somewhere that would start a user down that road?

I have to find and decrypt all the files, so that others can use them and so
when I toss the old Win10 box I don't make the files unusable for eternity.

It seems somewhat simple to find the files, using "cipher /u /n" on a CLI.
Time consuming on the Dropbox folder, which (collectively) has some 120,000 files/folders
in it (she's only created a few hundred of those; she hasn't been there long).
I can see how she propagated the problem once she started, as she does a lot
of copy-paste. How did she create file 1, though? It's not something I've
ever seen before.

Decent web page on searching for them, for those who want to know more:
http://mywindowshub.com/how-to-create-li...s-10-8-1-and-7/
And, the cipher command doesn't work until you have at least one encrypted file on your HDD.
 
When I searched for the .PFILE extension, I found info on the Microsoft Rights Management System.
Maybe this is in use at the company, it can also be used by an Individual.
It allows sharing of sensitive data across platforms (Windows, IOS etc.) and devices (PC, IPhon , Cloud etc.)

https://www.microsoft.com/en-us/download/details.aspx?id=40333


Link to white paper- (word File)
https://blogs.technet.microsoft.com/ente...ces-whitepaper/

It can be invoked in the application ie Word, excel etc-
While in Word, you can save a document and invoke SHARE PROTECTED (added by the RMS application)
 
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