IBM 5150

If You've Forgotten the File's Name
Sometimes you may get a message that says:
File not found
after you've typed a command. It may be caused by
spelling the filename wrong, among other reasons.
BASIC has a command, FILES, that works like the DOS
DIR command.
It lets you list what is on a diskette.
Then
you can check to see that the correct diskette is in
the drive and
that the .name was spelled correctly. You
do
not have to return to DOS and then come back to
BASIC. Following the BASIC prompt, Ok, just type: ~
files
and press the Enter key to see the name of all the files
on the default drive.
If you type:
files "b:* .bas
all the files on the diskette in drive B: that have .BAS
as their extension would be displayed.
BASIC 3-18