I know there have been topics on this, but there doesn’t seem to be a clear resolution unless I missed it. The macOS build is fine, but I noticed the icons in Windows 10/9/8/etc come out as Fisher Price sized. I am using an image set that is 128x128, 256x256, and 384x384.
Is there a Xojo IDE solution to this? Do I just use 64x64 icons on both builds?
It should be a 32x32 and a 64x64 image, for optimal performance. You might find that your window opens faster on the Mac as it is not having to cast such large images to a NSImage, and then push that NSImage to the GPU only to resize it down and draw it.
You could also consider 16x16 and 32x32 for smaller icons on the macOS, especially with Big Sur’s “Unified” toolbar.