Some file formats uploaded to the website server cannot be downloaded.

Recently, you have uploaded documents for office 2010, such as pptx, on the website. You cannot download the documents in the background management.

The solution is to add the MIME type to the website.

Add Extension Method (illustration ):

Go to the site corresponding to IIS → right-click [properties → HTTP header → MIME type → new → extension | Type

The following figure uses the word. docx extension as an example.
. Docx application/vnd.openxmlformats-officedocument.wordprocessingml.doc ument

 

Full Set of offices:
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. Docm APP/vnd.ms-word.doc ument. macroenabled.12
. 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
. Psms 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