the file you are trying to open is in a different format xls for EXCEL and WORDS

A file is in a different file format than its extension indicates

The file that you are trying to open in Microsoft Office 2010, 2013has a file name extension that does not match the actual file format of the file. This happen overnight. Please advise.
tomfontanillaAsked:
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tomfontanillaConnect With a Mentor Author Commented:
Thank you folks for your response. Thank you folks for your response. We found out the problem is unrelated to the file extension or corruption what so ever. One of our server was actually infected with a Trojan/Malware named CryptoWall/ CryptoLocker. CryptoWall/ CryptoLocker is another nasty ransomware virus that infects Windows systems, and files. As a virus, it keeps its original contents of a file, and encrypts all your files and keeps them locked and there is no way to use them until you pay the ransom asked. CryptoWall/ CryptoLocker can encrypt all known file types (documents, PDF, photographs, videos and more) on all connected storage drives or locations. That means that it can infect (encrypt) all the files on the local or network drive(s), even in cloud storage systems (e.g. Google Drive, Dropbox, Box, etc.). CryptoWall/ CryptoLocker does so, by adding strong encryption on each file. In simple words, you can’t open – or work with – your files anymore.
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Glenn RayExcel VBA DeveloperCommented:
I've seen third-party applications save files with ".xls" extensions that are, in reality, comma-separated values (csv) files.  Change the extension to what you think it's supposed to be and try opening it again.

Show the entire filename here and that may help us resolve this.  Make sure it includes the file extension (letters after the period).

-Glenn
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GrahamSkanRetiredCommented:
Make sure that the extensions are actually linked to the appropriate application:
Control Panel>Default Programs>Associate a file type or protocol with a a specific program
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tomfontanillaAuthor Commented:
In house fixed.
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