** When your program contains a fixed file name (like .completions or<BR>
.abbrev.defs), the file name usually needs to be different on operating
systems with limited file name syntax.
<P>
Now you can avoid ad-hoc conditionals by using the function
convert-standard-filename to convert the file name to a proper form
for each operating system.  Here is an example of use, from the file
completions.el:
<P>
(defvar save-completions-file-name
        (convert-standard-filename "~/.completions")
  "*The filename to save completions to.")
<P>
This sets the variable save-completions-file-name to a value that
depends on the operating system, because the definition of
convert-standard-filename depends on the operating system.  On
Unix-like systems, it returns the specified file name unchanged.  On
MS-DOS, it adapts the name to fit the limitations of that system.
<P>