> current version uses strstr() to check if the file has the expected ascii
> text extension ... this is buggy becouse this way a file named
> ".txt_hidden_file" or "foo.config.dat" are both seen as .txt files.

I added your routine chkext() to the code, but actually use it differently. I
display now ASCII files not by their extension, but the code checks for each file
to contain non-printable characters. If it contains all printable letters, and does
not have the extension PDF, PS or EPS, it's shown inline.