How to... update your item's thumbnail on Workshop

[RemingtonRyder]

https://steamcommunity.com/app/294100/discussions/0/359543951727504577/

They describe how to do it on Mac. In Windows it's very similar, just go to your Steam installation folder and look in \userdata\XXXXXXXX\294100\remote where XXXXXXXX is your particular user number.

[Thundercraft]

Those instructions are for a Mac. For Windows, this will not work as we can not follow Step 5 exactly: "Right click file > Get info > Lock". And, without this step, RimWorld tries to replace your new replacement thumbnail with the old thumbnail, making the effort fruitless. (BTW: This is mostly relevant for scenarios as those have a boring, default thumbnail. For mods, the thumbnail is automatically generated based on the main image.)

Instead, we have to load the image into software that will lock the file for us. Sadly, most image editing software won't do this. Myself, I managed to do it by loading the image into LibreOffice Draw (aka, OpenOffice Draw), which is a free program. Then we go to the Scenario Editor and upload (or update) our scenario and then, profit.

Though, according to this RimWorld Base article, replacing the thumbnail while having RimWorld running in the background will also prevent your replacement from being overwritten with the old default thumbnail. Though, I haven't tried that method.

[RemingtonRyder]

Necromancy much?

My preferred method of updating the thumbnail on Workshop these days is to use SteamCMD. It's a bit less fiddly, although it will log you out of the Steam client on your machine. I have instructions on how to use that here:

https://ludeon.com/forums/index.php?topic=33077.msg345175#msg345175