This beta idea is to create more markdown capabilities
Actually, there is no way to change the file extension of a page.
This is possible to change it at write/read but the wikiFN function that makes the translation between a ID and a file does not allow it.
A simple modification such as the below in thewikiFn function works for writing / editing a file (The history functionality was not tested).
if ($id == "markdown"){
$ext = 'md';
} else {
$ext = 'txt';
}
if(empty($rev)){
$fn = $conf['datadir'].'/'.utf8_encodeFN($id).'.'.$ext;
}else{
$fn = $conf['olddir'].'/'.utf8_encodeFN($id).'.'.$rev.'.'.$ext;
....
}
See forum thread on the subject