Well. \externalfigure[a.PDF][type=pdf] works for me. Thanks Zhichu and Luigi.

2008/11/1 luigi scarso <luigi.scarso@gmail.com>

On Sat, Nov 1, 2008 at 3:47 PM, Zhichu Chen <zhichu.chen@gmail.com> wrote:
Hi Zhaopeng,

On Sat, Nov 1, 2008 at 1:31 PM, Zhaopeng Xing <zpxing@gmail.com> wrote:
> Hi,
> There is a problem about a figure name. When I use pdf figures, capital
> "xx.PDF" can not be identified, while only "xx.pdf" is supported. I hope it
> can be fixed because my odf printer always give extension name "PDF".
> Thanks.

The following command works for me

By the way, I'm not trying to be professional, could you just write a shell
to convert those figures with "correct" suffix?
for j in *\.PDF;
k=`basename $j .PDF`.pdf
mv $j $k


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Zhaopeng XING

Tinbergen Institute