Pretty much all Windows programs support / in filenames. The main issue is some cmd builtins like mkdir/cd/del which have weird parsing rules where every / is i

Pretty much all Windows programs support / in filenames. The main issue is some cmd builtins like mkdir/cd/del which have weird parsing rules where every / is interpreted as starting a command-line switch, even if not preceded by a space. But even there, you only need to use quotes (mkdir "c:/test") to suppress the interpretation as a switch and then you can use paths with slashes just fine in batch files.