I tried
convert image.pdf[0] image.jpg
and
convert image.pdf'[0]' image.jpg
(and many other syntaxes...

in order to convert the first page only of the file image.pdf
Unfortunately I get the following error:
Magick: unable to open image `image.pdf[0]': No such file or directory @ er
ror/blob.c/OpenBlob/2589.
Magick: no decode delegate for this image format `prova_desc.pdf[0]' @ error/con
stitute.c/ReadImage/532.
Magick: missing an image filename `image.jpg' @ error/convert.c/ConvertImageComm
and/3016.
I am using ImageMagick 6.7.3 on Windows 7 Professional.
I believe this is a bug but, if it isn't, I would appreciate any help to make it work!
Thank you,
piopoi.