A retractable and extendable covering device (1) for architectural openings, which includes first and second substantially parallel posts (3, 5), a retractable and extendable substantially rectangular screen member (7), and a first flexible guide member (9; 109). The first flexible guide member (9; 109) is deflected into one of the first and second posts (3, 5) and slidably receivable therein. Each of the parallel posts (3, 5) has a hollow interior (19, 23), and at least one of the first and second posts being movable toward and away with respect to the other. The retractable and extendable screen member (7) has first and second pairs of opposite parallel edges and is mounted between the first and second parallel posts (3, 5) at its first pair of parallel edges. The first flexible guide member (9; 109) extends along one edge of the second pair of parallel edges of the screen member (7) and between the first and second posts (3, 5) for retaining the one edge of the screen member (7). The first and second parallel posts (3, 5) each include a base profile part (69; 169) and an auxiliary profile part (71; 171) defining the hollow interior (19, 23) therebetween for slidably receiving the first flexible guide member (9). Optionally the auxiliary profile part (71; 171) is mountable to the base profile part (69; 169) in a selected one of two different positions in which it is connectable to the base profile.