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I tested this code and it works in IE8, FF3.6 and Google Chrome, if I upload a Word-file with the extension .doc.

A few unsollicited pointers:
- It’s really none of my business, but why would you want to specify ‘allowed_types’ if you’re going to allow all kinds of dangerous files like php and exe anyway? Allowing php files to be uploaded is highly insecure! A user could upload a script that deletes all files in you webroot, or your entire database.
- You call an undefined variable $upload_error in your view, which throws an error. (Message: Undefined variable: upload_error)
- Try not to use short open tags, it makes your app less portable

might be usefull for some

I had to add
‘application/octetstream’
for FF/PC

for MS Office docx, xlsx, pptx

i had to add :

'application/x-zip-compressed'

in the mimes definitions you gave :

'docx'    =>    array('application/vnd.openxmlformats-officedocument.wordprocessingml.document','application/x-zip-compressed'),
                'xlsx'    =>    array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet','application/x-zip-compressed'),

why i cann’t upload file extensions (.docx, .xlsx, .rar) ?
but .doc, .txt, .zip it work?

This can be related to “/application/config/mimes.php” config file.
I solved the problem by adding/modifying 2 rules (see my previos post)

Try follow this steps :
Make a copy of your current “application/config/mimes.php” if something wrong occurs then you’ll be able to restore your application.

- Open “application/config/mimes.php”,
- If exists “docx” and “xslx” lines, replace them with this code,
- Else simply append this 2 lines at the end of the existings array :

'docx'    =>    array('application/vnd.openxmlformats-officedocument.wordprocessingml.document','application/x-zip-compressed'),
'xlsx'    =>    array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet','application/x-zip-compressed'),

hope it helps 😉