Here is a .spin2 syntax highlighter for Notepad++
I'm using version v7.8.6, which uses UDL2.1
It's great for opening .spin2 files and seeing the sections, operators, and distinguishing comments from code.
Unzip and in Notepad++ Menu, select Language -> User Defined Language -> Define your language...
Click on the [Import...] button
Those underscores in numbers made it tough, but it colors 99% of those cases correctly.
V01 - This is a good first version. It has all the spin operators and should have all ASM instructions. TODO is adding more spin keywords and builtin symbols.
V02 - Added missing jump instructions: (JNCT1, JNFBW, JNQMT, etc); Made registers ina, ptra, and pa keywords; Forgot WRWORD last revision, and added asm GETSCP and SETSCP because they exist.