Finding the files for a publication

How do I find the files for a publication ?

For example, for a publication with the identifier: halshs-00256587

The PDFs will be accessible from the URL URL_INSTANCE/PDF/, the images from URL_INSTANCE/IMG/, the "supplementary data" from URL_INSTANCE/ANNEX, etc...

URL_INSTANCE is the URL of the HAL instance (http://hal.inria.fr, http://hal.archives-ouvertes.fr, ...).

E.g. http://hal.inria.fr/halshs-00256587 ...

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