文件后缀 MIME TYPE
.doc ——application/msword
.dot ——application/msword
.docx ——application/vnd.openxmlformats-officedocument.wordprocessingml.document
.dotx ——application/vnd.openxmlformats-officedocument.wordprocessingml.template
.docm ——application/vnd.ms-word.document.macroEnabled.12
.dotm ——application/vnd.ms-word.template.macroEnabled.12
.xls ——application/vnd.ms-excel
.xlt ——application/vnd.ms-excel
.xla ——application/vnd.ms-excel
.xlsx ——application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltx ——application/vnd.openxmlformats-officedocument.spreadsheetml.template
.xlsm ——application/vnd.ms-excel.sheet.macroEnabled.12
.xltm ——application/vnd.ms-excel.template.macroEnabled.12
.xlam ——application/vnd.ms-excel.addin.macroEnabled.12
.xlsb ——application/vnd.ms-excel.sheet.binary.macroEnabled.12
.ppt ——application/vnd.ms-powerpoint
.pot ——application/vnd.ms-powerpoint
.pps ——application/vnd.ms-powerpoint
.ppa ——application/vnd.ms-powerpoint
.pptx ——application/vnd.openxmlformats-officedocument.presentationml.presentation
.potx ——application/vnd.openxmlformats-officedocument.presentationml.template
.ppsx ——application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppam ——application/vnd.ms-powerpoint.addin.macroEnabled.12
.pptm ——application/vnd.ms-powerpoint.presentation.macroEnabled.12
.potm ——application/vnd.ms-powerpoint.presentation.macroEnabled.12
.ppsm ——application/vnd.ms-powerpoint.slideshow.macroEnabled.12
.zip ——application/zip
.tar ——application/x-tar