As castor posted a recent release for world files of textures, so credits to him -
Here is Auction house files which will contain your portal you are searching for remember most tga files are really dds format.
World: 42
Buildings (Entity/Building)
A2_Blacksmith_shop01.tga
A3_watchtower_woods1.tga
b3__checkpoint12.tga
B3_Temion_Altercor12.tga
D_Item_01.tga
D_Item_02.tga
D_Item_03.tga
D_Item_04.tga
F_B1_Dun2_048.tga
F_B4_Shop3_01.tga
F_B4_Shop3_02.tga
F_B4_Shop3_03.tga
F_B4_Shop3_04.tga
F_B4_Shop3_05.tga
F_B4_Shop3_06.tga
F_B4_Shop3_07.tga
F_B4_Shop3_08.tga
F_B4_Shop3_09.tga
F_B4_Shop3_10.tga
F_B4_Shop3_11.tga
F_B4_Shop3_12.tga
L_A1_Wcaponbooth00_Dagger.tga
L_A1_Wcaponbooth00_Wood01.tga
L_R1_DUN2_032.tga
Orc_aremadejp10a.tga
Shapes (Entity/Shape)
A2_Blacksmith_shop01.tga
A2_Blacksmith_shop03.tga
A3__water_pail_01.tga
A3__wood08W.tga
A3_Brazier.tga
A3_unithouse_Goldcoin.tga
A3_wheel2.tga
bearhead.tga
bld__church_bar.tga
bld__church_Brick08.tga
bld__pot01.tga
bld__pot04.tga
bld__thing01.tga
bld__wood06W.tga
bld__wood07W.tga
bld__wood08W.tga
doghead.tga
dragonhead.tga
ds01.tga
F_B2_Tower09.tga
F_B4_Shop_01.tga
F_B4_Shop3_07.tga
F_B4_Shop3_08.tga
F_V1_Itemshop09.tga
F_V1_Itemshop10.tga
L_A1_Gate00_Stairs01.tga
L_A1_House02_Door01.tga
L_A1_House02_Railing.tga
L_A1_Wcaponbooth00_Dagger01.tga
L_A1_Wcaponbooth00_Shield.tga
L_A1_Wcaponbooth00_Wood01.tga
L_H2_Bridge00_Railing.tga
L_H2_Gate00_Roof.tga
L_H2_Gate00_WindowWood.tga
L_H2_grocer_TopWindow01.tga
L_H2_grocer_TopWindow02.tga
L_H2_vendors02_DowenRound.tga
L_H2_vendors02_DowenRound01.tga
L_H2_vendors02_DowenRound02.tga
L_H2_vendors02_RoofRound.tga
L_H2_vendors02_RoofRound01.tga
Paper.tga
R1_trade_carpet.tga
r1_trade_cloth01.tga
R1_trade_cloth02.tga
sundries03.tga
table_A_02_01.tga
table_A_02_02.tga
table_B_03_01.tga
table_B_03_02.tga
Wood_box_03.tga
Trees (Entity/Tree)
R1_trade_handrail01.tga
R1_trade_handrail02.tga
Grass (Entity/Grass)
CT01.tga
R1_trade_auction_po.tga
Objects (Entity/Object)
F_B1_Dun2_048.tga