Epson CW3S16 Operation Manual page 86

(dollar sign)
$
(percent sign)
%
&
(ampersand)
(and) (parenthesis)
(minus sign or hyphen)
-
[ and ] (brackets)
(underline character)
-
The following are examples of allowable filenames:
. JANUARY
CHAPTER.001
MEMO.APR
MAYSALES. % &$
$$,SALES.OCT
These filenames are valid because none of them are too long,
and only legal characters have been used. The following are
examples of illegal filenames, along with an explanation:
3RDQUARTER.SALES
This is too long. MS-DOS will accept this filename, but it
will be shortened to fit the size limits. The altered filename
would read 3RDQUART.SAL. As you can see, both the
filename and its extension have been shortened to the legal
length.
CHAPTER/4
The slash ( / ) is an illegal filename character. MS-DOS
will reject the filename and ask for another.
Using MS-DOS With
Your Computer
4-21