That is strange, [link=http://www.angelfire.com/pro2/fred-aa/extra330s_Texture.zip]Here[/link] is the texture I made for the Stock Extra330s (Matt Roland), You can try:
1. Right click the above link to 'Save Target as',
2. extract the bmps to the Extra330s folder,
3. RENAME ALL *.tmt files to *.bak_tmt
4. load the plane in AFPD, it shows up with the new skin