After upgrading to Tika 1.21 I have noticed several known XLSX files are detected by Tika as "application/x-tika-ooxml". I think I've narrowed it down to the new StreamingZipContainerDetector. After inspecting the "[Content_Types].xml" of these XLSX files there is no reference to any of the configured content types for XLSX in the OOXML_CONTENT_TYPES in StreamingZipContainerDetector. Specifically,
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml" "application/vnd.ms-excel.sheet.macroEnabled.main+xml" "application/vnd.ms-excel.sheet.binary.macroEnabled.main" I do see a content type of "application/vnd.openxmlformats-officedocument.spreadsheetml.template.main+xml" in "[Content_Types].xml". Is the StreamingZipContainerDetector missing the XSSFRelation TEMPLATE_WORKBOOK in OOXML_CONTENT_TYPES?
