hello again philippe,
in your first post you wrote "pdftotext.exe" -
it seems that you installed the dos-version on an unix-server???
the unix download is:
http://www.foolabs.com/xpdf/download.html
x86, Linux (glibc 2.2, staticly linked to Motif, t1lib, and FreeType 2):
xpdf-3.00-linux.tar.gz (4544077 bytes)
tomas