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https://www.iso.org/standard/71691.html
Not as proprietary as one may think, but definitely a way for indoctrination by Microsoft and therefore problematic
Although XLSX is standardized as OOXML according to ISO/IEC 29500, Microsoft’s implementations often deviate from the specifications. Furthermore, features often change undocumented, which complicates compatibility with open-source software such as LibreOffice.
From the article
Yes, i always wonder about that
Soweit ich gelesen habe, sind die LibreOffice Formate technisch viel besser. Wenn nur Microsoft Formate betrachtet wurden, ist das ein Offenbarungseid.



