Compiler, Assembler, Linker, or Decoder
TEXTPATH={<path>}
<path>: Paths separated by semicolons, without spaces.
When this environment variable is defined, the Assembler will store the listing files it produces in the first directory specified in path. If TEXTPATH is not set, the generated listing files will be stored in the directory the source file was found.
TEXTPATH=\sources\txt;..\..\headers;\usr\local\txt