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[HELP] Attachment error-damaged files - Printable Version

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[HELP] Attachment error-damaged files - gearSecond - 2015-12-15

2 weeks ago i've installed mybb, at the beginning everything's good, i can download my attachment without error or damaged files.
But after 2 weeks, i try to upload and download attachment again there's message when open the files

"There was an error opening this document. The file is damaged and could not be repaired"

i try to open pdf, xlsx, docx everything just same error.

the files size under 200kb (so its not size problem)

firewall and antivirus use fortigate

--sorry for bad english--