Basic Products Can Create and Use Non-Standard File Names
ID: Q94783
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The information in this article applies to:
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Microsoft Visual Basic Standard and Professional Editions for Windows, versions 2.0, 3.0
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Microsoft Visual Basic programming system for Windows, version 1.0
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Microsoft Visual Basic Standard and Professional Editions for MS-DOS, version 1.0
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Microsoft Basic Professional Development System for MS-DOS, version 7.1
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Microsoft QuickBASIC for MS-DOS, version 4.5
SUMMARY
Microsoft Visual Basic and other Basic products can create and use
non-standard MS-DOS file names. For example, a file name with an embedded
space is a non-standard file name. However, Microsoft doesn't recommend
that you use non-standard file names because they can cause problems
with other software.
MORE INFORMATION
According to the MS-DOS documentation, file names must:
- Have no more than eight characters.
- Contain only the letters A through Z, the numbers 0 through 9, and
the following special characters: underscore (_), caret (^), dollar
sign ($), tilde (~), exclamation point (!), number sign (#), percent
sign (%), ampersand (&), hyphen (-), braces ({}), parentheses (), at
sign (@), apostrophe ('), and the accent grave (`). No other special
characters are acceptable.
- Not contain spaces, commas, backslashes, or periods except for the
period that separates the name from the extension.
- Not be the following reserved filenames: CLOCK$, CON, AUX, COMn
(where n=1-4), LPTn (where n=1-3), NUL, and PRN.
The Basic OPEN command allows you to open a file name that breaks some
of these rules. For example, you can open a file that has a space embedded
in its name.
The following example creates a file giving it a name that contains a
space. Then it writes data to the file, reopens it, and prints the data
on the screen:
OPEN "A B" FOR OUTPUT AS #1 'There is a space between A and B
PRINT #1, "HELLO THERE"
CLOSE #1
OPEN "A B" FOR INPUT AS #1
INPUT #1, A$
PRINT A$
CLOSE #1
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