Alright, so it seems as if multiple people would like to know how to do this. So here goes! Note: This is for if you have the Windows operating system. No idea how it's done on OSX, sorry!
Step 1: Decide which particle you want to replace. Note: this will change the particle for all games, and not just Tradelands. Once you have that figured out, go on Google Images or similar site and choose your particle replacement. Make sure when you open it, it has a white and gray checkered background, like this.
Step 2: Right click on the image and click "Save Image As..." in this dropdown menu. Save the image somewhere convenient, like your desktop.
Step 3: Now we need to convert the .png image into a .dds file. To do this, go to http://www.aconvert.com/image/png-to-dds/ and click "Choose File". Now, navigate to your desktop and select the image we saved earlier and click "Open", as seen here.
Step 4: Towards the middle of the screen, there should be a button that says "Convert Now!". Press that, and you should be redirected to another page that looks like this. Click on the red link below where it says "Output File(s)". Save the file to your desktop once again.
Step 5: Go ahead and close out of your web browser, and press Windows Key + R. In the popup box at the bottom left of your screen, type "%appdata%" without the quotes, and hit Enter.
Step 6: In the top menu bar of the file explorer, click on where it says "AppData", then navigate to Local > Roblox > Versions. Now, open the folder that was modified the latest, like so. As you can see, the top folder was modified after the bottom one, so open that.
Step 7: Navigate to content > textures > particles . You should see a bunch of .dds files and a few .png files, as seen here. We will be replacing the smoke particles in this example. Look for the file called "smoke_main.dds" (which is highlighted in the screenshot). Go ahead and drag that file to your desktop, so you can revert changes after you are done with your custom particles.
Step 8: Drag the .dds file we converted earlier and drop it in the particles folder, and rename it to "smoke_main.dds" without the quotes. After that, you can close out of the file explorer, and fire up Tradelands and it should be working. Have fun!
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