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What was the particular reason behind that decision? It confuses me even more, since .csproj files has XML format.

Attila Kun
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The .sln file format was introduced nearly 15 years ago by Visual InterDev 97.
XML was only defined in 1998.

SLaks
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    @0A0D: I believe that back then, Visual Studio was a bundle (like Office), not an application. – SLaks Jul 11 '11 at 20:28
  • Not arguing : http://ecx.images-amazon.com/images/I/41L6xyud0mL._SL500_AA300_.jpg –  Jul 11 '11 at 20:29
  • 0A0D: The point is that back then VS wasn't a single IDE for all products. VB had its own file formats, VC++ as well and apparently only InterDev used the `.sln` file format initially. – Joey Jul 11 '11 at 20:30
  • @0A0D: Yes, but it was a package, not an application. (Just like there is no program called `Office`) – SLaks Jul 11 '11 at 20:34