**** file-coding-system-alist specifies which coding systems to use<BR>
for certain file names.  It works like network-coding-system-alist,
except that the PATTERN is matched against the file name.
<P>
Each element has the format (PATTERN . VAL), where PATTERN determines
which file names the element applies to.  PATTERN should be a regexp
to match against a file name.
<P>
VAL is a coding system, a cons cell containing two coding systems, or
a function symbol.  If VAL is a coding system, it is used for both
decoding what received from the network stream and encoding what sent
to the network stream.  If VAL is a cons cell containing two coding
systems, the car specifies the coding system for decoding, and the cdr
specifies the coding system for encoding.
<P>
If VAL is a function symbol, the function must return a coding system
or a cons cell containing two coding systems, which is used as above.
<P>