VB Builder Description:

Pinpoint errors in your VB programs to the exact line
where they occur. VB Builder is a VB 5/6 Add-In
that creates line numbered versions of your VB
program so that you can use the VB error line
function (erl) in your error handling code.
VB Builder also compiles your programs and stores
each line numbered version in a separate directory
based on the current version number of the program.