ISSUE RESOLVED: How to post up custom Decals to your Desktop the easy way.
If you have lost a custom desktop decal that you like or, in my case, need - my players want to have a Combat Cheat Sheet on the desktop to use in play - then follow these steps.
STEP ONE
Load your custom decal into FGU as a regular image file (I have tested jpg and png - no other image file types have been tested) as an asset in a sub-folder. In my file structure, it looks like this (yours may look different): "Username">AppData>Roaming>Smiteworks>Fantasy Grounds>Campaigns>"Your Campaign Name Here">images>"Subfolder name such as Custom Decal?">"Image Name Here"
CAVAT
I can confirm that an image size of 210kb or 3293 x 2033 px spanning two side-by-side 16:9 ratio, 28-inch flat-panel monitors will display cleanly and within the borders of the Traveller desktop. HOWEVER, your mileage may vary, and you might need to manipulate your Custom Decal image to fit through trial and error. I am sorry, but I don't have time to test all the possible combinations for you - you'll have to figure this out for yourself.
STEP TWO
Now, load FGU, load your Traveller campaign - as per standard.
STEP THREE
Open your asset folder on the desktop: Top right corner of desktop>Library>(dropdown list)Assets>(find the Custom Decal file that you want to use on your desktop in the Assets popup screen) click to open that image asset>bottom right-hand side of the Image Preview popup you will see a button labelled "Set Background Decal">press button and Viola!
You now have a custom image as your desktop decal. The decal remains in place even if you shut FGU down and restart it again. NB: Only ONE background decal can appear on the desktop at any one time.
Tired of your custom image?
Use the same process to swap out the custom decal for a different custom image OR use one of the images that Mongoose supplies. Open the Options popup window (top righthand corner of your desktop), find the "Background Decal" button (bottom of the options pop up, first row, first column), choose a new decal, and your custom decal will be swapped.
To get the custom decal back, you'll have to follow steps two and three again.