Can't apply texture to metaballs

hi, how can i apply texture to Metaballs EX9?
when i open help example i see that it works just with two .dds files that are in vvvv’s assets folder but it’s doesn’t work with any other files (even other .dds). why it can be so?

It is not a regular texture. It is called “cube texture”, look it up. Does not need to be dds anyway. also note the last pin on the filtexture node, it specifies the type.