'Alternative Formats' was not getting flagged for files with an all-caps file extension. This is no longer the case:

file_example_odp.odp

file_example_odp copy.ODP

sample odt.odt

sample odt copy.ODT

sampleppt copy.PPT

sampleppt.ppt

samplepptx copy.PPTX

samplepptx.pptx

TestWordDocX copy.DOCX

TestWordDocX.docx

TestWordDoc copy.DOC

TestWordDoc.doc

pdf-sample copy.PDF

pdf-sample.pdf