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I was not able to make the above work (I was worrying about
.tiff files), however, the following (in
config.php) did seem to work for me:
$ImgExtPattern = ereg_replace("(\)$)", "|tiff|tif|TIFF|TIF)", $ImgExtPattern);
The Replace Regular Expression looks for the closing
$ImgExtPattern and replaces it with the extension(s) that you would like to add, plus the closing
Simon Forknall, 02 June 2009 (PmWiki V2.2.1, Mac OS X)