Can't index PDFs

Am testing Perlfect locally. Indexer works fine with HTMLs, but will not index pdfs, giving the following errors.

Conf.pl as follows:

$DOCUMENT_ROOT = 'c:\index';

@EXT = ("htm","html","shtml","asp","txt","pdf");

"pdf" => "c:\xpdf\pdftotext FILENAME -",

Error messages:

    1: c:\index/cintro.html (0.52 KB)
Ignoring 'c:\index/cintro.pdf': illegal characters in filename
    2: c:\index/cintro.pdf (7.75 KB)
    3: c:\index/cintros.html (4.83 KB)
    4: c:\index/cintro_ind.html (0.25 KB)
    5: c:\index/Course Introduction.htm (11.37 KB)
    6: c:\index/index.html (1.54 KB)
Ignoring 'c:\index/mod02.pdf': illegal characters in filename
    7: c:\index/mod02.pdf (142.70 KB)
Ignoring 'c:\index/mod03.pdf': illegal characters in filename
    8: c:\index/mod03.pdf (77.88 KB)
Ignoring 'c:\index/mod04.pdf': illegal characters in filename
    9: c:\index/mod04.pdf (62.75 KB)
Ignoring 'c:\index/mod05.pdf': illegal characters in filename
    10: c:\index/mod05.pdf (108.41 KB)
Ignoring 'c:\index/mod06.pdf': illegal characters in filename
    11: c:\index/mod06.pdf (100.29 KB)
Ignoring 'c:\index/mod07.pdf': illegal characters in filename
    12: c:\index/mod07.pdf (110.09 KB)
Ignoring 'c:\index/mod08.pdf': illegal characters in filename
    13: c:\index/mod08.pdf (88.88 KB)

Grateful for any assistance