Sources can include, among others: - other office suites (not LO or MS Office), - non-office apps, - web services.
Bug 140202 is a META bug tracking issues related to MS Office format files created by external producers (software other than Microsoft Office). These issues typically involve compatibility problems, incorrect formatting, or unexpected behavior when opening such files in LibreOffice https://blockblastadventure.com As a META bug, it serves as a parent for multiple related issues, helping developers track and resolve various cases where LibreOffice struggles with externally produced MS Office documents.