Well I tweaked an item.dat file fine but when I put the head texture inside labeled 'head' as a .tga file with RLE compression off, it didn't show up. I also didn't type /dl ____ before typing /lp 0 _____ incase you wondering if I was stupid and I didn't use my normal account so that it wouldn't /dl automatically.

is it correctly sized?
since you didn't use your regular account are you sure you put it in the right place and are lp'ing right?

I've tried the same, and it doesn't work out for me either. Did before though... I've also asked otherp people, and they experience the same problem.

Is there something wrong with the good'ol preview feature?

It's quite necessary for artists who'd like to preview textures in 512 res.

I put it in 512, and glad to hear that I'm not the only one experiencing this.

EDIT: I just tried it on toribash 3.94, no luck.

I never tweak the dat files, I don't understand them

Just go /dl some non existing name (00test) for example
Then just save a tga file with the corresponding name in the res of 128 256 or 512
(I've only tried 128 tho) in the customs folder and then /lp that name (00test for example)

Works on 3.99