De-compiling Gas Calculation Program (Visual Basic)

My company had a project 2-3 years ago to produce 2 gas pipeline calculation applications for Windows 9x, 2000, XP which was marketed succesfully. However the original programmer has moved abroad and the backup source code has been deleted A new customer has requested some modifications to the application that would require it to be recompiled. We were wondering if anyone had the expertise to decompile the application to produce the original source code so that updtae s can be successfully made. ## Deliverables All visual basic source code in electronic text files, decompiled from the original version so that the original could be recompiled to deliver exactly the same functionality. In order for the contract to be fulfilled the source code must be able to be compiled with VB6 minimum to produce the same results as the original applications. Also future versions need to be recompiled with appropriate changes. ## Platform Windows 9x, 2000, XP