XLSX and DOCX files being downloaded as ZIP files in Internet Explorer

I have an applicaction in php mounted in Apache where I show a list with .xlsx and .doc files to download, In Firefox and G Chrome download correctly, but in IE downloads them as zip.

I configure the .htaccess in my /var/www/mysite/.htaccess with:

AddType application/vnd.ms-excel.sheet.macroEnabled.12 xlsm
AddType application/vnd.openxmlformats-officedocument.spreadsheetml.sheet xlsx

in the /etc/mime.types:

application/vnd.openxmlformats-officedocument.presentationml.template           potx
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet               xlsx

(and more)

in the /etc/apache2/sites-enabled/mysite.conf

Alias /DH /var/www/DH
<Directory "/var/www/privado">
    Options Includes
    AllowOverride All
    Order Deny,Allow
    Allow from all
    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet xlsx
</Directory>

but when I restart the apache server says:

Output of config test was:

AH00526: Syntax error on line 7 of /etc/apache2/sites-enabled/dh.conf:
Invalid command 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', perhaps misspelled or defined by a module not included in the server configuration
Action 'configtest' failed.
The Apache error log may have more information.

Thanks in advance