Retexture an MLO or prop without opening OpenIV
You bought an MLO and everything is right except the sign over the door. The usual answer is OpenIV, a texture dictionary you have to find first, and an export that has to land back in the same file. This does it in the browser: click the surface, drop your image, download the resource.
Nothing about the model changes
A model does not store its pictures. It stores texture names, and the game looks those names up in a texture dictionary — a .ytd shipped beside it, or one embedded inside the .ydr or .yft itself. Change the picture stored under a name and every surface that samples that name changes with it.
That is the whole operation here. Geometry, collision, LODs and every meta in the resource are left exactly as they were; only the image behind a name is rewritten. It is also why the result drops straight back into the same server — nothing about how the resource is registered has moved.
Clicking a wall tells you which texture it is
The hard part of a retexture has never been the paint. It is working out which of the forty textures in the pack is the one on that wall — a question OpenIV answers by making you open each dictionary and guess from thumbnails.
On upload the tool unpacks the resource and builds the map the browser needs: a GLB for every model, a PNG for every texture, and the link between them — which geometry samples which name. So when you click the sign in the 3D view, it can tell you the texture that surface is reading, and offer you the slot to replace it.
What comes back
The download is your own upload, rebuilt. Files you replaced are written back into the container they came from; every file you did not touch is copied through unchanged, in the same place, under the same name.
Because nothing is renamed or re-registered, replacing the folder on the server and restarting the resource is the entire install.
Match the size, or say why not
Give the replacement the same dimensions as the texture it stands in for whenever you can. A sign sheet that was 1024x1024 wants 1024x1024 back: the UV layout on the model has not moved, so a different aspect ratio stretches your artwork across whatever the mesh expects.
Powers of two matter for a second reason. A texture whose sides are not powers of two cannot carry a full mip chain, so the game samples the top level at every distance — the sign stays crisp up close and shimmers from across the street, and it costs full memory the whole time. If your artwork is 1000x1000, export it at 1024x1024.
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