Here also just open your map up in HMT o.75 then go to bitmaps and go to whatever one you want to skin export to a photoshop image(.psd) so if your skinning with pixelmator or photoshop you can open it up make your changes and save as whatever you want to name it and as a .jpg (NOT .JPEG 2000) And If your computer has really good graphics change the quality to all the way up or to maximum
Best of modding Pakar45
Also why not join are community it's great so please join!
