I\'m unable to highlight my assembly.
I know the question was for Sublime 2, but if you want a nice highlighter I'm using the MasmAssembly on Sublime 3 and found that its quite good. It highlights even ZMMs registers and the lastests SSE instructions.
You can install it using the package control plugin, nevetheless here is the repository: https://packagecontrol.io/packages/MasmAssembly