In order that the replace_cobj.bat file will be executed before the linking process starts, the AddIn
'VB6 IDE Linker AddIn' (http://www.vbforums.com/showthread.php?866321-VB6-IDE-Linker-AddIn) must be registered.
Only then the LinkBefore entry of the 'VBCompiler' section in the .vbp file will be recognized.

[VBCompiler]
LinkBefore=replace_cobj.bat