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All config file is here LocalSetting.php
....
$wgUseImageMagick = true;
$wgImageMagickConvertCommand = "/usr/bin/convert";
$wgEnableUploads = true;
# Strict file extension
$wgStrictFileExtensions = false;
# Allowed fileTYpe upload
$wgFileExtensions = array(
'png', 'gif', 'jpg', 'jpeg', 'doc', 'xls', 'mpp',
'application/pdf', 'ppt', 'tiff', 'bmp', 'docx', 'xlsx','pptx',
'ps', 'odt', 'ods', 'odp', 'odg', 'txt', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'application/vnd.ms-excel',
'application/zip',
);
...