Digital BW, The Print

I've just started testing QTR for Windows and have found the 
following executeble files in the ..\bin directory.

qacv.exe
qacvraw.exe
qadd.exe
qcurve.exe
qdensity.exe
qdiff.exe
qdotgain.exe
qgamma.exe
qgraph.exe
qlimit.exe
qline.exe
qmerge.exe
qpart.exe
qpart2.exe
qplot.exe

Does anyone have any information about what they do or are they 
required as part of the QTR runtime distribution?

Thanks,

Don Bryant