Theme files still use the old 1.0 File Syntax meaning it can’t be read by the SDK or modern file syntax readers

When creating a theme file, the header only needs to contain the type, name and colours. The first line must be Type=1.0 followed by a blank line, then Name= with the name of the theme right after and the colours. These must be hex values (without the hash). You can declare both by having two lines starting with BckColorOne= and BckColorTwo= followed by the hex code. Here’s an example theme:

Type=1.0

Name=SplameiPlay Docs Theme Demo

BckColorOne=663b18
BckColorTwo=8f2c21

When saving the file, make sure the file ends in .sptheme so SplameiPlay can recognise and use the file.