if u want a way to get them working with out ace then u will have to doit manually by placing ur repaints in to the main folder ie (c:\program files\microsoft games\microsoft flight sim\SimObjects\Airplanes\cs_B727-200)
then open the aircraft cfg in note pad making sure the box always open with DOSE NOT HAVE A TICK IN IT then copy text that looks some thing like this
[fltsim.xx] (chaing the xx to the next number in line)
title=CS 727-200 Captain Paintxx (change the xx to the same number)
sim=cs727200
model=re_another company (u may need to chainge this to the correct aircraft)  
panel=
sound=
texture=OLD british airways1 (chang this to the texture folder name)
kb_checklists=
kb_reference=
atc_id=CAA (chaing this)
atc_airline=BRITISH AIRWAYS (change this)
atc_flight_number=BACAA (chaing this)
ui_manufacturer=Boeing
ui_type=727-200 another company/RE (change this)
ui_variation=BRITISH AIRWAYS (change this)
ui_typerole=Commercial Airliner
ui_createdby=Captain Sim
description=727 Captain: 727-200 Expansion Model v2.2\british airways b-acwf by nath2889 (change this to the orthers name wish)
visual_damage=1

change every thing that has (change) next to it to the repaint u are tring to use

number the xx with the next number ie if you have 8 727-200
then the [fltsim.XX] should look like this [fltsim.9]
also title=CS 727-200 Captain PaintXX should look like this title=CS 727-200 Captain Paint9
once installed the ace editer will pick it up so if you wish to delete it you can use the ace option

use the manual for the correct model type its right at the bottom hope this helps