Python export to specific path

Question

I want to export a list with all my objects in my scene, but it always outputs to the default folder. I already have a little UI and when I press the button it should open the file browser and I want to set the specific path.

Is there a way to it?

Here is the operator it should work in

 #Operator Export
    class RGL_OT_export(bpy.types.Operator):
        bl_idname = "object.export"
        bl_label = "Regalplannung"
        bl_description = "Exportier Bestückung"
    def execute(self, context):     

        selection = bpy.context.selected_objects
        result = ""

        for sel in selection:

            bpy.context.object.modifiers["Vollständig gefüllt"].show_viewport = False

            parent = sel.parent
            parent_0 = parent.dimensions [0]
            parent_1 = parent.dimensions [1]
            parent_2 = parent.dimensions [2]

            x = (sel.name.split("_")[0])
            y = (sel.name.split("_")[1])
            z = (sel.name.split("_")[2])
            h = (sel.name.split("_")[3])

            if parent_0 < parent_1:
                dims = parent.dimensions [0] / sel.dimensions [0]
            else:
                dims = parent.dimensions [1] / sel.dimensions [1]

        result += "%s - %s - %s - %s - %f\n" % (x, y, z, h, dims)

        tempFolder = os.path.abspath (bpy.context.scene.render.filepath)
        filename = os.path.join (tempFolder, "newfile.txt")
        os.makedirs(os.path.dirname(filename), exist_ok=True)
        file = open(filename, "w")
        file.write(result)
        file.close()
        return {'FINISHED'}