I recently got emailed a .sxc file. I did not know what that was, so off too Google I go, and find the site fileinfo.net which lists lots of extensions. There I am enlightened: OpenOffice spreadsheet format.

But then I was curious. So I look up .ms, .mws, .mw and .nb. Results:
.mwTextMacWrite Text Document
.mwsAudioMWave DSP Synth Instrument Extract
.nbDataMathematica Notebook
No entry for .ms. Why is this? Why is Mathematica so widely ``known'' where Maple is not? I genuinely don't understand this.

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