What is a MIME type for .docx, .xlsx and .pptx?

The MIME type for .docx (Microsoft Word), .pptx (Microsoft PowerPoint), and other Open XML file formats is application/vnd.openxmlformats-officedocument.<filetype>.

Here are the specific MIME types for some common Open XML file formats:

.docx (Microsoft Word): application/vnd.openxmlformats-officedocument.wordprocessingml.document
.pptx (Microsoft PowerPoint): application/vnd.openxmlformats-officedocument.presentationml.presentation
.xlsx (Microsoft Excel): application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

It's worth noting that some older web servers and browsers may not recognize these newer MIME types, so you may also want to add the older MIME types as well for compatibility.

For example, the older MIME types for the above formats are:

.docx: application/msword
.pptx: application/vnd.ms-powerpoint
.xlsx: application/vnd.ms-excel

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