Borland C++/Turbo C Assembler Include file
ASI is a file extension for an assembly language file used with Borland Assembler. ASI stands for ASsembler Include. ASI files are created using the Turbo C or Borland C++ programming languages, which are very close to machine code (also referred to as assembly code). ASI files can be opened and edited by Borland Assembler.
Learn more about .ASI files:
Visit the Borland Assembler web page.
Read more about Assembler Language at ITKnowledgeExchange.com.