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I want to download the source code of .NET Framework 4. From the official website, I get the files with the extension .aspx; WinRAR is pretending that those are broken CAB files, and Windows won't open them if they are renamed to .cab or .exe.

What is the actual type of those files? How to open them? Are they actual files or the website is just broken and sending random stuff?

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.aspx files are for ASP.NET web forms development. Why do you need to open them? What are you trying to do? – KronoS Feb 27 '13 at 21:37
The actual extension is wrong, since the website is broken (well, not broken enough to give access to its own source, but still broken when it comes to HTTP headers of served files). That's why I'm asking about the actual type of those files. – MainMa Feb 27 '13 at 21:40
What's your actual endgame here. Are you trying to install .NET 4? – KronoS Feb 27 '13 at 21:44
@KronoS: no. The actual goal is to get the source code of .NET Framework, like I specified both in the title of my question and in the first sentence of the question itself. – MainMa Feb 27 '13 at 21:47
up vote 1 down vote accepted

Found it. Those files are MSI packages, so the correct extension would be .msi.

Thanks to the answer by Christopher Currens to a similar question on Stack Overflow.

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