Mооnst@r
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I added a line, and it really worked. I somehow didn't think it could be due to the "Combat visual" parameter.
I replaced the dds images you provided; the background is transparent, and everything looks great. Did you add an alpha channel to the original image to get a transparent background?
I cut out the background, but it still appeared when exporting.
And the "Creature" folder doesn't affect anything; the problem was really in "Combat visual" and in the error in the texture name you pointed to.
I checked again just now: it doesn't launch the game with the "Creature" folder. It says what I mentioned above, and the original version of the HoMM V game cannot be found.
It's better to check it on a clean game.