VB6 complied EXE all of sudden became very big

Hi All
I have an old application in VB6 running for years. From time to time I made few changes and recompile.
Today I made a change referencing actrpt2.dll to an older version and all of sudden the exe size changed from 2.5 MB to 60. If I change the reference back to a different version of actrpt2.dll it goes back to 2.5MB
Any idea what is the issue?
Thanks
maylo