I'm not sure why you want to access the .bas files. There is no way to convert basic source code to LabVIEW. Some things like declarations, memory allocation, are not required in LabVIEW or are done for you by the LabVIEW compiler. Constants, local and global variables, user defined types in the form of custom controls, all exist in LabVIEW but in general, are much easier to use. Maybe if you post a snippet of VB code, someone can translate it into LabVIEW.
