In Opera, goto the URL opera://settings/startPage. Enable "Hide Speed Dial", disable "Receive promoted...", disable "Show Speed Dial suggestions", and disable "Show news...". But, make sure "Hide search box" is disabled. You want the search box on the start page to show.

Then, goto the URL opera://settings/wallpapers and disable "Enable wallpapers".

All that is to just make the startpage load faster. You can skip all those steps if you want.

Now, create a folder on you desktop named "Override Startpage".

In it, create these two files with a text editor (like Notepad):

manifest.json:

{
    "name" : "Override Startpage",
    "version" : "0.1",
    "description" : "Override Startpage",
    "permissions": [
        "tabs"
    ],
    "background": {
        "scripts": ["background.js"]
    },
    "manifest_version": 2
}

background.js:

var page = "https://www.google.com/";
var start = "chrome://startpage/";

chrome.tabs.onCreated.addListener(function(tab) {
    if (tab.status === "complete" && tab.url === start) {
        chrome.tabs.update(tab.id, {
            url: page
        });
    }
});

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
    if (changeInfo.status === "complete" && tab.url === start) {
        chrome.tabs.update(tabId, {
            url: page
        });
    }
});

Then, in Opera, goto the URL ```opera://extensions`. Then, switch on Developer Mode at the top right. Then, click the "Load unpacked" button and point it to the "Override Startpage" folder that's on your desktop.

Any time you want to change the page that's loaded, edit the "page" URL in background.js and click the reload button next to the extension on the opera://extensions page.

You can then goto opera://settings/onStartup and adjust settings there too if needed.

@Daigo Thanks for the clarification.

Assuming you're not using Opera Sync, if you have the old Opera profile, you should just be able to go into the profile folder, copy the "Bookmarks" and "BookmarksExtras" files and paste them in the new profile on the new computer(overwriting the existing ones, while Opera is closed). In Opera, goto the URL opera://about for the location of the profile folder.

@Daigo So, you're saying it doesn't really play in the developer version either?

It happens to some users. Download the Opera installer, launch it, click "options", set "install path" to the current installation, adjust any checkboxes you want and choose upgrade.

On Windows 10 at least, you can right-click on a folder in Explorer and choose "pin to Quick Access", which will also be shown in Save As dialogs.

Also, in "Organize -> Folder options -> General", you can set Explorer to open Quick access by default.

I don't remember if Win7 and or 8 have that. or not.

Filename might have been too long or there was some character in the filename that Opera didn't like.

@burnout426 said in Always open files of this type: .msrcincident:

The extensions to open value is probably a comma-separated list.

Actually, a colon-separated list.

In the "Preferences" file in Chrome, I see:

download {
   "directory_upgrade" : true,
   "extensions_to_open" : "torrent",
   "prompt_for_download" : false
}

I'm guessing that's it. The extensions_to_open value is probably a comma-separated list.

@kevt Yes. They're json files. I'll see if I can find out where it's stored.