File type: Basic source code
The BAS file extension and all files with the said file extension are referred to as source code files. These files have been written in the BASIC programming language or Beginners All-purpose Symbolic Instructional Code.
This high-level programming language has been the basis for a number of programming languages such as Microsoft Virtual Basic.
These days, files with the file extension .bas are written in what's called Visual Basic. Since the said file extension is a source code file, it then contains a statement sequence. The functions and content of the modules or files with the file extension BAS vary depending on what they had been programmed to do.
One such module is the USB Communication File, intended to enable Visual Basic to contact the USB devices and USB ports.
The files with the file extension BAS and are associated with the said function include the USBInterface.bas, OSInterface.bas, and HIDInterface.bas. However, their integration into the Visual Basic application requires the assistance of the file APIGID32.dll in order to function properly.