Unable to upload .docx

Tried to upload a .docx file 
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Document.docx
Invalid File
Maybe add the format?:yippe:

Upload Errors
Document.docx
Invalid File
Maybe add the format?:yippe:
0
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Comments
You must embrace the future formats!
I though ISO was to do with photography??
One example is the filesystem included in DVDs: no matter who makes the disc, it will play in all players, because they're all designed to read the standard.
I guess there must be something about photography as well.