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I use a combination of 2 programs.
FSrepaint V2 (This is a payware program from Abacus Publishing) it decodes certain texture files and converts them into easy to read formats. it has a 3D window to view your editing live and has a simple tool to edit aircraft information and descriptions.
PaintDotNet (www.paint.net) a freeware program that i use to fine tune the textures. I can use photoshop but i find this program easier to use and just as effective.