aspx meaning - what is x meaning

we know asp.net file extention is .aspx, do you know what is "x" meaning?

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Well the former name of asp.net was asp+ and since they can't use + in the extension they thought "lets put x instead of +, they look similar" or something along that line, so they put added in 'x' to the original .asp extension...also if you noticed, many ASP.NET pages in the microsoft website end with the extension '.mspx' which indicates that the server is configured to parse the code in .mspx file the same way they were supposed to do with normal .aspx files...so .aspx is not really the true file extension of asp.net, as with some configuration you can tell the server to parse files with different extensions as normal ASP.net files...for example if you don't have php installed, I think you can even have the server parse files with .php extensions as asp.net files...if the code in them is that of asp.net that is ...

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