If you like the "ZX SNA File Viewer" please consider supporting it.
This extension adds a readonly file viewer for ZX Spectrum SNA, snapshot files. It shows registers, a memory dump and the included ZX screen. It can read 48K and 128K SNA files.
The SNA file format specification can be found here.
Install through Visual Studio Code Marketplace. The extension is called "ZX SNA File Viewer".
Just click on a file with the *.sna extension. The file is opened and shown in the text editor area.
Alternatively you can open a SNA file via "Open With...":
When hovering over a value or register name you will get additional info like the offset or the value in decimal:
