XPLM Texture IDs name well-known textures in the sim for you to use. This allows you to recycle textures from X-Plane, saving VRAM.

Warning: do not use these enums. The only remaining use they have is to access the legacy compatibility v10 UI texture; if you need this, get it via the Widgets library.

xplm_Tex_GeneralInterface"0" The bitmap that contains window outlines, button outlines, fonts, etc.
xplm_Tex_AircraftPaint"1" The exterior paint for the user's aircraft (daytime).
xplm_Tex_AircraftLiteMap"2" The exterior light map for the user's aircraft.