File Name: craxdrt_res_en.dll
Description: Crystal Reports ActiveX Designer Runtime Support
Default Location (for CR 10 Developer): C:\Program Files\Common Files\Crystal Decisions\2.5\bin
I'm not really sure what it's used for, but since it isn't necessary for deployment, I would guess that it's used in Development mode, particularly if you're creating reports within the VB IDE (.dsr's).
-dave