Tandy 1000 MS-DOS - Examples of Filenames

Chapter 2 / Organization Of Information
Extensions such as .new, .irs, and .pay let you create files that
have the same name (but different extensions) or they can help
you divide files into categories.
You can also use an extension to indicate file type, such as the
following:
.bas
for
BASIC programs
.txt
for
ASCII text
.dat
for
Data files
.obj for
Object code
.rel
for
Relocatable code
.src
for
Source code
If you add the extension .dat to a file named invntory, the file-
spec becomes:
invntory.dat
Note: Once you include an extension in a filename,
you
must use it whenever you specify the file.
Examples of Filenames
Some legal filenames are:
rawdata2
REPORTS
X.x
proJect%.txt
PROG1 . ba5
SAMFILE
2AR.dat
The examples below are illegal filenames:
.DATA
open ordr
*' isn't a legal character for names
the period can be used only to separate the file-
name and extension
a
name cannot contain a space
7