Trying to open a VS 2012 solution (SLN file) explicitly in VS 2013 succeeds. Simply double-clicking it in Windows Explorer still opens it in VS 2012 instead.
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To solve this issue I just changed the following lines of the .sln file:
Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
into these:
Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2013
The comment line is to be changed as it is parsed by the solution loader.