Today, a colleague asked me: “how to download file with docx extension (MS Word 2007) in IE6?” because IE automatic changes the .docx to .zip. I thought to solve this problem very easy by directly link download but I’m wrong 
It seems a IE bug??? So I recommend him that he should use PHP header to output binary content of file.
IE handle stupid or smart in this case?
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i ever this trouble when i want download 1 file by redirect to that file but with IE docx will change it to .Zip
Solution you change htaccess in folder where have file to download :
file .htaccess:
AddType application/vnd.openxmlformats-officedocument.wordprocessingml.document docx
ok => IE will download right file docx
Oh, he is the man I mentioned in this article
So basicly additional line below into .htacess to make sure IE can download right file:
AddType application/vnd.openxmlformats-officedocument.wordprocessingml.document docx
But if server not allow to set from .htaccess???