Assuming you are referring to the iCue Software:

About 72M comes from the directories plugins (some pngs), GameSdkEffects, driver and QtQuick[1]:

  ~/Downloads/Program Files/Corsair/iCUE  du -d1 -h | sort -rh
  421M    .
  28M     ./plugins
  19M     ./GameSdkEffects
  13M     ./driver
  12M     ./QtQuick
  5.4M    ./sounds
  5.2M    ./translations
  3.2M    ./System
  1.4M    ./imageformats
  1.2M    ./QtGraphicalEffects
  1.2M    ./platforms
  406K    ./predefined_data
  367K    ./QtMultimedia
  358K    ./mediaservice
  286K    ./QtQuick.2
  265K    ./scenegraph
  134K    ./QtQml
  130K    ./audio
  105K    ./Qt
  77K     ./legal
  33K     ./iconengines
  25K     ./playlistformats

The bulk comes from these files:

  ~/Downloads/Program Files/Corsair/iCUE  ls -shS | head -10
  total 333M
  158M cuedevres.bin
   51M cueres.bin
   36M iCUE.exe
   16M opengl32sw.dll
   14M vcredist_x86.exe
  4.8M Qt5Gui.dll
  4.8M efm8load.exe
  4.7M Qt5Core.dll
  4.4M Qt5Widgets.dll

The bin files are identified as:

  ~/Downloads/Program Files/Corsair/iCUE  file *.bin
  cuedevres.bin:   Qt Binary Resource file
  cueres.bin:      Qt Binary Resource file
  manifestres.bin: Qt Binary Resource file

So, it's mostly the QtQuick framework.

[1] https://en.wikipedia.org/wiki/Qt_Quick