When IBM® Rational Rhapsody launches an Eclipse-based IDE, whether the generic Eclipse or Wind River Workbench, it checks the rhapsody.ini file to determine the path of the IDE.
Then property that stores this information is called EclipsePath and it is located in the section [IDE], for example:
EclipsePath=l:\windriver\workbench-2.4\wrwb\2.4\x86-win32\bin\wrwb.exe
If you want to switch between the generic Eclipse and Wind River Workbench, change the value of this property in the rhapsody.ini file.