Not sure if this is what you're looking for but if you put the cursor on the line with file:// and run the command flink it will open that file at the specified line. If the line starts with http it will open it in a browser. Right click in slick edit window and select "edit this menu" and add the flink command to the menu if you want to be able to do right click -> flink.
_command void flink() name_info(',')
{
_str s1, s2, s3;
get_line(s1);
if ( pos('http',s1) == 1 ) {
safe_goto_url(s1);
return;
}
parse s1 with 'file://' s2 '#line=' s3;
s2 = maybe_quote_filename(s2);
if ( file_exists(s2) ) {
edit(s2);
goto_line(s3);
}
else {
message("no such file " :+ s2);
}
}