Riešením je zadať kratší typ obsahu.
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Dlhé formuláre:

"application/vnd.openxmlformats-officedocument.wordprocessingml.document" (pre súbory .docx)
"application/vnd.openxmlformats-officedocument.wordprocessingml.template" (pre súbory .dotx)
"application/vnd.openxmlformats-officedocument.presentationml.presentation" (pre súbory .pptx)
"application/vnd.openxmlformats-officedocument.presentationml.slideshow" (pre súbory .ppsx)
"application/vnd.openxmlformats-officedocument.presentationml.template" (pre súbory .potx)
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" (pre súbory .xlsx)
"application/vnd.openxmlformats-officedocument.spreadsheetml.template" (pre súbory .xltx)

Krátke formuláre:
"vnd.ms-word.document.macroEnabled.12"
"vnd.ms-word.template.macroEnabled.12"
"vnd.ms-powerpoint.template.macroEnabled.12"
"vnd.ms-powerpoint.addin.macroEnabled.12"
"vnd.ms-powerpoint.slideshow.macroEnabled.12"
"vnd.ms-powerpoint.presentation.macroEnabled.12"
"vnd.ms-excel.addin.macroEnabled.12"
"vnd.ms-excel.sheet.binary.macroEnabled.12"
"vnd.ms-excel.sheet.macroEnabled.12"
"vnd.ms-excel.template.macroEnabled.12"