QProcess fail to handle path with spaces under windows [OLD ISSUE]

Due to Qt5.3 bug, installing Displace under c:\program files\ will prevent QProcess to work. This reflects with many parts of the app:

Running DtEditor and TsEditor from Displace will not work
TsEditor will not run R scripts and crash if they are installed in the installation directory (i.e. gen_ts.R).
Need to update QT

Workaround: Install displace under C:\displace