Odd document corruption issue just started out of the blue

Hi All,

I run a network with a few servers on it and we've recently experienced some odd "corruption issues".  On one of our Servers within a file share that users access often we have a customers folder where users keep Word docs of Quotes for customers.  There are folders within it that are named by customer.  2 days ago, all of the Word files inside of folders of all of the customers from A through the beginning of the Bs maybe Be...... show the Word File Conversion window and ask for what type of encoding you want.  Everything after the BE's seems fine.  I have been chasing the problem and cannot figure out why.  

Interestingly enough, yesterday, quite a few Word Docs on a DIFFERENT Server are now doing the same exact thing.  I have attached the screenshot of the error message.  Any help or guidance would be completely appreciated.  Thank you.
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byundtMechanical EngineerCommented:
There are also a couple of ransomware viruses that affect Office files. I hope this isn't your problem, because the files are toast. You can remove the infection using the Microsoft Safety Scanner (http://www.microsoft.com/security/scanner/en-us/default.aspx). The issue is discussed in Updated 9/11 - "Excel cannot open the file [filename] because the file format or file extension is not valid." opening Office files

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EmulousAuthor Commented:
Thank you for the quick response.  Is this something that would be on the servers or is it more likely a client PC.  If so, any tricks on figuring out which one?
byundtMechanical EngineerCommented:
More likely, it is on a client PC, possibly one that got disconnected before it got past damaging files whose name began with A or B.

I'm not the right person to ask if there are tools that can scan across a network, but I'll add a Malware/Virus TA to the question so those people will see it too.
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EmulousAuthor Commented:
Thank you.
EmulousAuthor Commented:
At least put me on the right path.
byundtMechanical EngineerCommented:
I don't believe the question is answered yet, so I reopened it (in my capacity as Topic Advisor).

If you found virus/malware infection on one or more client computers, then the question could be closed satisfactorily. Likewise, if you found some other explanation for the problem.

Until you are able to conclusively identify the source of the problem, please keep the question open. Doing so will give the Malware/Virus Experts a chance to weigh in, and will make this thread more useful in the Experts-Exchange database.

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