The following from on-line help:
quote:

When executing a command line whose first token does NOT contain an
extension, then CMD.EXE uses the value of the PATHEXT
environment variable to determine which extensions to look for
and in what order. The default value for the PATHEXT variable
is:

.COM;.EXE;.BAT;.CMD

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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.