I have noticed this edit on MathOverflow.

Are all links containing numdam.org/numdam-bin dead - and can they be fixed by using numdam.org/item?

Search returns 122 results on MO and 28 results on math.SE.

Search returns 159 results network-wide.

Looking at the results returned above, not all of those links are dead. For example this post has a working link of that form: numdam.org/numdam-bin/item?id=CM_1987__64_1_31_0