Grease a 10-inch pie plate; set aside. For crust, in a medium saucepan melt the chocolate pieces and margarine or butter. Remove from heat; stir in oats, flour, and brown sugar. Press onto bottom and sides of prepared pie plate to form a firm, even crust. Bake in a 350 degree F. oven for 10 minutes.
Meanwhile, for filling, in a medium mixing bowl combine pie filling, cherries, and almond extract. Pour into the baked crust.
For topping, in a small mixing bowl stir together the flour, brown sugar, and oats. Cut in the margarine or butter until mixture resembles coarse crumbs. Stir in the chocolate pieces. Sprinkle over filling. Bake in a 350 degree F. oven for 35 minutes. Cool on a wire rack. Makes 10 servings.