Not so lucky there either:
....21 katalogów
....22 katalogi
....23 katalogi
....24 katalogi
....25 katalogów
And the same pattern repeats modulo 10.
EDIT: And as I think about the 1001 part... Actually the following sounds right to me (translating "in X directories"):
....w 1000 katalogów (w tysiącu katalogów)
....w 1001 katalogu (w tysiąc-jednym katalogu)
....w 1002 katalogach (w tysiąc-dwóch katalogach)
etc.
Not so lucky there either:
....21 katalogów
....22 katalogi
....23 katalogi
....24 katalogi
....25 katalogów
And the same pattern repeats modulo 10.
EDIT: And as I think about the 1001 part... Actually the following sounds right to me (translating "in X directories"):
....w 1000 katalogów (w tysiącu katalogów)
....w 1001 katalogu (w tysiąc-jednym katalogu)
....w 1002 katalogach (w tysiąc-dwóch katalogach)
etc.