To make a VS project support .asm files, go to Project->Build Customizations, and enable "masm." Once that's done, you should be able to add .asm files (just use the wizard to create a .cpp and ...

This Visual Studio Code extension adds 65816 and Super FX Assembly (Argonaut Syntax) support, with additional support for the directives used by Argonaut's SASM and ARGSFX assembler family. It also ...