Shortcut to open a specific file in VSC?

You can do it with tasks, here is how:

Open your tasks.json file:

F1 -> type: "Tasks: Configure Tasks" -> select: "Open tasks.json file"

Paste in the following:

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "openMyFile",
            "type": "shell",
            "command": "path_to_your_VSCode path_to_your_file.txt"
        },
    ]
}

In your keybindings.json add:

{
    "key": "ctrl+scrolllock", # Or some other binding
    "command": "workbench.action.tasks.runTask",
    "args": "openMyFile" # <- Your task's name in this case openMyFile
},

That should do it.

The solution that relies on launching the code command in Tasks feels a bit heavyweight and does not work with Code-Server. Here's a more "native" approach:

1. Install the VSCode Macros extension.
2. Make a file macros.js somewhere (e.g. in $workspace/.vscode/macros.js):

   const vscode = require('vscode');
   
   module.exports.macroCommands = {
      OpenTodo: {
         no: 1,
         func: () => openFile("/full/path/to/your/todo.md")
      },
   };
   
   async function openFile(filename) {
     const document = await vscode.workspace.openTextDocument(filename);
     const editor = await vscode.window.showTextDocument(document);
   }
   

3. Add to your settings.json:

   "vscodemacros.userMacroCommands": [
     {
       "path": "/full/path/to/your/.vscode/macros.js",
       "name": "OpenTodo"
     },
   ]
   

4. Open Keyboard Shortcuts (Ctrl+K Ctrl+S by default), find the command "VCSMacros: User Macro1" and map it to a key of your preference. Reload window (at least in code-server that was necessary for the keyboard shortcut to start working).