Hope Qt still release Visual studio 2010 binaries for Qt 5.6, cause Visual Studio 2010 is the latest IDE that could be able run under XP
Unsolved
General and Desktop
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http://doc.qt.io/qt-5/windows-issues.html
"Visual Studio 2012 and later do not support building for Windows XP out of the box. However, support for targeting XP was added in an update of Visual Studio 2012. This works also with Visual Studio 2013." -
Do you have to develop ON Windows XP or FOR Windows XP?
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Qt 5.6.0 no longer runs any tests for VS2010. (https://wiki.qt.io/Qt_5.6_Tools_and_Versions)
If you want to stick with VS2010, then I recommend that you also stick with Qt 5.5.1.