Col. Burton

Am completing a MOD SDK 5 mod, and an unable to locate some unit art files:

These files are for the GDI Mammoth, some from the \art\FX, \art\EX, or \art\GU folders
'art:fxformation.xml'
\art\fx\fxformation.xml'.
'art:fxinterlacedmask2.xml'
'art:gumamm_k.tga
'art:gumammd_k.tga'
'art:fxrailguncoremask.xml'
'art:fxrailguncoredistortion.xml'
'art:extnktrack.xml'

I know everything works fine without them, I guess it's just the OC in me: I like 'clean' compile log
files without 'File not found' errors.
These files are not in the MOD SDK, or optional art\texture files.
Where would they be? If in a compressed file, how to extract?

Thanks for any help.