X  ("Executor")  by Philema Perspectives

This is a program to execute another program: it will find, load and execute
a named program from anywhere on the current disk - whether it is on the
current path or not.  The normal way it should be used is with the name as
its single operand: it can execute .COM, .EXE or even .BAT files - you do
not have to specify which ! (As a matter of fact, the extension code you
specify will be ignored entirely).

X will seek the program you want to load, starting with the root directory:
you may specify the disk from which it is to be loaded, if desired.

If what is to be executed is a .BAT file, X will first attempt to reload
COMMAND.COM (as a 'shell'); normally the location of COMMAND.COM will be
expected on the drive from which you originally booted the system - so if
you do not have a hard disk, you may get an unexpected 'cannot find
COMMAND.COM' message; don't worry - you have not been hit by a virus.

Most programs can be loaded by X: occasionally, some programs do something
quite special - such as update themselves - and so they will not work
properly when 'piggy-back' loaded by X.  This will probably be quite rare,
but will not be a major problem anyway.