File Extension ASPX
ASPX files are web pages which are generated server-side using the ActiveX scripting language. File extension ASPX files works the same as ASP since their code is processed by a web server and the output results are converted to HTML code that is sent and viewed in a Web browser. Developed by Microsoft in 2007, this scripting engine comes as part of the Internet Information Services and is part of the Server Systems free components.

Since most of the ASPX file extension pages are coded using the VBScript language syntax, which first become available in 2007, these files can be opened and edited using Microsoft's VB programming language. Using this scripting language is installed by default during the installation of Microsoft Windows.
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To execute an ASPX file or VBScript, it must be contained within its host environment. This means the Windows Script Host must be the local execution platform. These environments can however be embedded on other programs enabling the scripts to be run. When running in the Internet Explorer browser, ASPX file extension behave like JavaScript enabling more functionality that cannot be performed by the common use of standard HTML.

When using IE, Opera or Firefox browsers, ASPX must have additional non-ActiveX code enabling the server and client-side scripts to communicate and display the right information. Active server pages usually contain HTML code, script commands and COM elements enabling them to contain interactive pages and we-based applications that are both easy to edit and modify.
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During the server processing process, a file extension ASPX code is executed systematically from top to bottom and standard HTML pages are given as a result. Since an ASPX page is purely HTML, they are browser independent and can be run on any browser. ASP is in fact very powerful and can be used to retrieve binary files and enable interaction with remote databases. ASPX code within a file extension is also re-usable.