XSET allows you to put anything you want into an environment variable.You can then use it just as if you had created it with the standard SET
command.

XSET is fully compatible with MS-DOS (from 3.30), PC-DOS, DR-DOS, 4DOS,
NDOS, FreeDOS, Windows 3.x, Windows 95 Windows 98, Windows ME,
Windows NT, Windows 2000, OS/2, ...

XSET major features:
- catch the output of any command (internal or external) or program and
put it into an environment variable.
- XSET can manage variable contents of more than 128 characters (your
path can now be as long as you want)
- built-in full floating-point calculation functionality:
You can program incremental loops, input a calculation string and
output the resulting number,...
- built-in commands to modify the output of a program or a string given
on the command-line (extract a part of a string, lower/uppercase,...)
- built-in commands to give you access to some system data (date, time,
filesize, ...)
- built-in commands to clear whole environment or restore a saved one.
- support for long/short filenames
- high-level user interface input/output (line-editing, colors, windows,
boxes,...).