This shameful limitation of the fileinput module is not relevant anymore.

pitrou · pitrou · commit 1e4fe702f60b · 2011-10-12T19:11:12.000+02:00
diff --git a/Doc/library/fileinput.rst b/Doc/library/fileinput.rst
@@ -171,10 +171,6 @@ and the backup file remains around; by default, the extension is ``'.bak'`` and
 it is deleted when the output file is closed.  In-place filtering is disabled
 when standard input is read.
 
-.. note::
-
-   The current implementation does not work for MS-DOS 8+3 filesystems.
-
 
 The two following opening hooks are provided by this module:
 
