How to share files from Mac mountain lion to windows 7?

Question

Google's documentation on Chrome extension development has information on passing messages between a background script and a content script. I'm trying the example code:

background.js

chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
    chrome.tabs.sendMessage(tabs[0].id, {greeting: "hello"}, function(response) {
        console.log(response.farewell);
    });
});

content_script.js

chrome.runtime.onMessage.addListener(
    function(request, sender, sendResponse) {
        console.log(sender.tab ?
            "from a content script:" + sender.tab.url :
            "from the extension");
        if (request.greeting == "hello")
            sendResponse({farewell: "goodbye"});
        //return true;
    });

They don't include a manifest file, so I created one (and three icons):

{
    "background": {
        "persistent": false,
        "scripts": ["background.js", "content_script.js"]
    },
    "content_scripts": [ {
        "js": ["content_script.js"],
        "matches": ["<all_urls>"]
    } ],
    "description": "Test passing messages between a background script and a content script using Google's example code.",
    "icons": {
        "16": "img/icon_16x16.png",
        "48": "img/icon_48x48.png",
        "128": "img/icon_128x128.png"
    },
    "manifest_version": 2,
    "name": "Test Google Chrome extension messaging",
    "permissions": ["notifications"],
    "version": "2017.8.25"
}

But when I load this extension, the Console reports:

Error in event handler for (unknown): TypeError: Cannot read property 'farewell' of undefined at chrome-extension://ibocemgcnbijkacfkpokffkfkinmenlc/background.js:3:29

I searched online for other cases of the response being undefined, and a few sources recommended adding return true;. I tried that, but it made no difference (in the code above, it's commented out).

Can anyone see how I could get this working? Thanks!

Solution

Go to System Preferences

Select Sharing

Turn on file sharing

This is what it should look like:

Under shared folders in the middle, You'll see the + Icon. Click it and select the folder you want to share. Then click the Options button on the right. This window will come up:

Fill in the check box for Share Files and Folders using SMB (Windows). You will now see it on the Windows machine (I tested it).