If you are having problems with your website visitors trying to download .DOCX or .DOCM files, you might be a victom of the new Microsoft 2007 and newer formatting. The linux servers are often setup by default with a “magic mime types” module that attempts to figure out the mime type by whats inside the document. These files are actually ZIPs of XML documents, so it tells older browsers like IE7-8 that its a ZIP file.
To fix this problem add this to your mime.types OR .htaccess in Apache. Don’t forget you need to restart apache after you add them (cmd: service httd restart).
AddType application/vnd.ms-word.document.macroEnabled.12 docm AddType application/vnd.openxmlformats-officedocument.wordprocessingml.document docx AddType application/vnd.openxmlformats-officedocument.wordprocessingml.template dotx AddType application/vnd.ms-powerpoint.template.macroEnabled.12 potm AddType application/vnd.openxmlformats-officedocument.presentationml.template potx AddType application/vnd.ms-powerpoint.addin.macroEnabled.12 ppam AddType application/vnd.ms-powerpoint.slideshow.macroEnabled.12 ppsm AddType application/vnd.openxmlformats-officedocument.presentationml.slideshow ppsx AddType application/vnd.ms-powerpoint.presentation.macroEnabled.12 pptm AddType application/vnd.openxmlformats-officedocument.presentationml.presentation pptx AddType application/vnd.ms-excel.addin.macroEnabled.12 xlam AddType application/vnd.ms-excel.sheet.binary.macroEnabled.12 xlsb AddType application/vnd.ms-excel.sheet.macroEnabled.12 xlsm AddType application/vnd.openxmlformats-officedocument.spreadsheetml.sheet xlsx AddType application/vnd.ms-excel.template.macroEnabled.12 xltm AddType application/vnd.openxmlformats-officedocument.spreadsheetml.template xltx