Eden obviously does a string compare to find out which textureSource is currently in use. This string compare includes the file ending (.paa).
So, something like this works: in Eden:
textures[] = { "\cup\trackedvehicles\cup_trackedvehicles_bmp\BMP\Data\trup_ext0_tak_CO.paa", "\cup\trackedvehicles\cup_trackedvehicles_bmp\BMP\Data\veza0_tak_CO.paa" };
while this doesn't work:
textures[] = { "\cup\trackedvehicles\cup_trackedvehicles_bmp\BMP\Data\trup_ext0_tak_CO", "\cup\trackedvehicles\cup_trackedvehicles_bmp\BMP\Data\veza0_tak_CO" }
Eden will ignore the texture that was set. However, you CAN modify it in Eden or Virtual Garage.