in reply to Trouble opening files from a directory: "no such file".

You need to prepend the directory name to your file name, just like the documentation for readdir advises. Change:
open (FIC, $fichier) or die "Impossible d'ouvrir le fichier ", "$f +ichier : ", "$!";
to:
open (FIC, "$dossier/$fichier") or die "Impossible d'ouvrir le fic +hier ", "$fichier : ", "$!";

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Re^2: Trouble opening files from a directory: "no such file".
by Alienor (Initiate) on Aug 09, 2011 at 20:05 UTC

    I knew it had to be a silly tiny detail I was missing (I swear I read the documentation on readdir)!

    Thank you toolic. Consider yourself virtually hugged and kissed!