@c
@node Portable File Format
-@appendix Portable File Format
+@chapter Portable File Format
These days, most computers use the same internal data formats for
integer and floating-point data, if one ignores little differences like
necessary to exchange data between systems with incompatible data
formats. This is what portable files are designed to do.
+The portable file format is mostly obsolete. System files
+(@pxref{System File Format}) are a better alternative.
+
@strong{Please note:} This information is gleaned from examination of
ASCII-formatted portable files only, so some of it may be incorrect
for portable files formatted in EBCDIC or other character sets.