Thread:Project:Support desk/Is there a way to upload MS Excel .xls files and PDF files in Mediawiki?/reply (6)

The link does not say that "it would be secure to upload MS Office files" generally. The link says it's fine to upload ZIP types. "MS office files" can be a number of file formats which changed over the years, and probably also their ability to include some malicious code (VBS macros).