Previously there were
ASP, DOC, XLS, PPT etc and now
ASPX, DOCX, XLSX, PPTX respectively.
X denotes in
ASPX, DOCX, XLSX, PPTX etc?
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back in the year 2000 asp.net was branded as ASPX end then everything became .NET even BIZTALK server was BIZTALK.NET
The X in Office files denotes that it is now a different storage format. take an Excel file XLSX, rename it to .ZIP or .RAR and then you will see a folder with a bunch of XML files