TRIGEM CW3S20A Canadian Product, Руководство по эксплуатации

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A data file containing a written report can’t do anything by
itself. On the other hand, a word processor is useless without
documents to work on.
Filenames and Extensions
Needless to say, each file on a disk must be uniquely
identifiable. To achieve this, MS-DOS requires that you name
every file you create, as you create it.
In order to be able to manipulate files easily, MS-DOS has
certain rules that you must follow when naming files. As you
will see, these rules leave you a great deal of freedom in your
selection of filenames.
Each filename can be up to eight characters long. To this eight
character name can be added an “extension”. Extensions
always begin with a period ( . ) which is followed by up to three
characters.
The format for a valid MS-DOS filename is:
ABCDEFGH.JKL
Most of the characters and symbols on your keyboard are
available for use in filenames. These are:
The letters A through Z
The numbers 0 through 9
The following symbols:
(exclamation point)
(“at” sign)
(number sign)
4-20 Using MS-DOS With Your Computer