Mime Types for Office 2007 documents and IIS

http://www.bram.us/2007/05/25/office-2007-mime-types-for-iis/

http://technet.microsoft.com/en-us/library/ee309278(v=office.12).aspx

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Yes, it's just an IIS setting: by default, it will only serve files for which the extension matches a defined MIME type.

To allow .docx files to be downloaded, follow the steps from the KB article linked above:

Open the IIS Microsoft Management Console (MMC), right-click the local computer name, and then click Properties.
Click MIME Types.
Click New.
In the Extension box, type the file name extension that you want (in this case, .docx).
In the MIME Type box, type application/vnd.openxmlformats-officedocument.wordprocessingml.document (thanks to @web developer for pointing out this MIME type, which supercedes the 'application/msword' from my original answer).
Apply the new settings. Note that you must restart the World Wide Web Publishing Service or wait for the worker process to recycle for the changes to take effect. In this example, IIS now serves files with the .docx extension.


Note that the KB article uses the generic application/octet-stream MIME type: although that generally should work, if a more specific MIME type exists, such as application/msword, it's always best to use that.

.docm,application/vnd.ms-word.document.macroEnabled.12
.docx,application/vnd.openxmlformats-officedocument.wordprocessingml.document
.dotm,application/vnd.ms-word.template.macroEnabled.12
.dotx,application/vnd.openxmlformats-officedocument.wordprocessingml.template
.potm,application/vnd.ms-powerpoint.template.macroEnabled.12
.potx,application/vnd.openxmlformats-officedocument.presentationml.template
.ppam,application/vnd.ms-powerpoint.addin.macroEnabled.12
.ppsm,application/vnd.ms-powerpoint.slideshow.macroEnabled.12
.ppsx,application/vnd.openxmlformats-officedocument.presentationml.slideshow
.pptm,application/vnd.ms-powerpoint.presentation.macroEnabled.12
.pptx,application/vnd.openxmlformats-officedocument.presentationml.presentation
.xlam,application/vnd.ms-excel.addin.macroEnabled.12
.xlsb,application/vnd.ms-excel.sheet.binary.macroEnabled.12
.xlsm,application/vnd.ms-excel.sheet.macroEnabled.12
.xlsx,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltm,application/vnd.ms-excel.template.macroEnabled.12
.xltx,application/vnd.openxmlformats-officedocument.spreadsheetml.template