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I'm a new chrome extension developer, and I was going through the Chrome tutorial on making a 'Hello World' extension, here's my code:

When I went to load the unpacked extension it said the manifest file was missing or unreadable. Yes I have the image in a folder with it and it is correctly named manifest.json

FIXED 'CRX HEADER INVILED' & ATTEMPED TO DOWNGRADE EXTATION crx header invalid, crx header invalid idm, idm extension crx header invalid -.

Eric Leschinski

8 Answers

Something that commonly happens is that the manifest file isn't named properly. Double check the name (and extension) and be sure that it doesn't end with .txt (for example).

In order to determine this, make sure you aren't hiding file extensions:

1. Open Windows Explorer
2. Go to Folder and Search Options > View tab
3. Uncheck Hide extensions for known file types

Also, note that the naming of the manifest file is, in fact, case sensitive, i.e. manifest.json != MANIFEST.JSON.

JeremyJeremy

My problem was slightly different.

By default Eclipse saved my manifest.json as an ANSI encoded text file.

Solution:

• Open in Notepad
• File -> Save As
• select UTF-8 from the encoding drop-down in the bottom left.
• Save

I also encountered this issue.

My problem was that I renamed the folder my extension was in, so all I had to do was delete and reload the extension.

Thought this might help some people out there.

Eric Leschinski

Mine also was funny. While copypasting ' manifest.json' from the tutorial, i also managed to copy a leading space. Couldn't get why it's not finding it.

Some permissions issue for default sample.

I wanted to see how it works, I am creating the first extension, so I downloaded a simpler one.

Downloaded 'Typed URL History' sample from
https://developer.chrome.com/extensions/examples/api/history/showHistory.zip

which can be found at
https://developer.chrome.com/extensions/samples

this worked great, hope it helps

If you are downloading samples from developer.chrome.com its possible that your actual folder is contained in a folder with the same name and this is creating a problem. For example your extracted sample extension named tabCapture will lool like this:

Kindly check whether you have installed right version of ChromeDriver or not . In my case , installing correct version helped.

DID NOT USE the Chrome download on the top of the Chrome download site. Scrolled to the bottom and found 'Download Chrome for another platform'.Selected Windows 10/8/7 64-bit (I have a 64 bit machine) and installed.It worked.

I imported my bookmarks and all is well.

(Note: The step above about the bookmarks may not be necessary as they should be in your Google+ sync data, but in an earlier attempt, I reset all the sync data in my profile.)

MarmiK

protected by XanAug 31 '15 at 9:12

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In this tutorial, you will read How to Add or Remove Extension of File Type in Windows 10. You will come across three sections in this post where the first will have the tips to display the file type extensions for the known files. The second section consists the steps to add the Hidden file extensions. And the last section will guide you to add or remove Shortcut name (prefix) extension in shortcut created files in Windows 10.

What Are File Name Extensions?

You find a group of characters at the end of each of your Files everywhere. This could be .jpg, or .png, or .doc or .txt or any other. These are none other than File Name Extensions and tell that which types of files these are.

Why Are File Name Extensions so important?

When you meet a malicious threat the main thing you need to know is which type of file is damaging your PC so that you can rectify the issues or take a precautionary measure to avoid this kind of attacks in future. So, Microsoft should make this feature available by default because as the extensions are hidden you will never get to know the file type. But I infer they have emphasized on the clean interface rather than security.

You may like to read:

How to Add Extension of File Type in Windows 10

Just like previous editions, Windows 10 also refuses to show Extension of File Type in Windows 10 of the known files by default. The main reason of the hidden file extensions is to refrain user’s mind from confusion with the exhibition of different types of extension. But Windows 10 always gives you the chance to display the file extensions like avi, doc, exe, mp3, txt and a lot more.

Steps to follow:

• Open This PC.
• On the top, click View.

• A new ribbon arrives. Take your attention to the extreme right corner of the ribbon and click Options.

• A new window of Folder Options arrives on your screen.
• Get into the View tab.

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• Beneath the Advanced settings section, go to the Hide extensions for known file types option.
• Clear the checkbox of the option and click Apply and Ok buttons.
• Now, you can see the file extensions of the known files.

After the completion of the above process, Windows starts showing the Extension of File Type in Windows 10 and you can easily figure out the individual file type.

How to Add Hidden Extension of File Type in Windows 10 for Security Purpose

After you clear the checkbox Hide extensions for known file types in Folder Options, Windows 10 will display most of the file extensions leaving behind some of the system reserved file extensions like URL (internet shortcuts), lnk (file shortcuts). These file extensions are not displayed in File Explorer and are tucked away by default through Registry keys.

NeverShowExt is the Registry key which when set for any Extension of File Type in Windows 10 in Registry Editor, disallows the same file extension to display in File Explorer. There are certain file extensions which are always kept hidden in File Explorer. They are –

LNK (File/Folder Shortcut)

URL (Internet Shortcut)

PIF (MS-DOS Program Shortcut)

SCF (Windows Explorer Command)

SHS (Shell Scrap Object)

SHB (Document Shortcut)

XNK (Exchange Folder Shortcut)

The above-referred file types hold NeverShowExt strings in the Registry Editor which restrict them from displaying their file extensions. And hence, this type of behavior brings harm to your computer. Suppose anyone creates a harmful program and change its name to example.txt.url. And as per Windows nature, the URL extension will not be shown and you would assume it to be a txt file and attempt to open it and thus brings threats to your computer. So, your big concern would be to solve the problem.

For the hidden file types, you need to remove the NeverShowExt string in Registry Editor and then only you can see the file extensions.

• Hit Windows and R keys cumulatively to see the Run command dialog box.
• Type Regedit and press Enter key.

• If UAC prompts up, click Yes button.
• Click Edit followed by Find in the menu bar.
• Or you can also use the shortcut keys Ctrl + F.

• A Find box appears now.
• In the Find what space, type NeverShowExt and hit Enter.

• The search begins and the first string of NeverShowExt will be demonstrated in the Registry Editor window.

• In Registry Editor, you will see many NeverShowExt strings but you are advised to delete the strings of the preferred keys. Take precautions before deleting the strings because you might see it in other types like the library, account picture, and things like that.
• So before deleting, take a backup of the respective key. Right-click on the key and choose Export.

• Now, get to the right pane of the key and select NeverShowExt string and hit Delete key or right-click on the string and click Delete option.

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• To see the next available NeverShowExt string, press F3 key.
• Delete the string of the key if needed.
• After the process is over, restart your Windows 10 computer and see the file extensions.

How to Add or Remove Shortcut word after File Name in Windows 10

When you perform a right-click on a folder, file or even a drive, the context menu displays you some of the commands. If you choose to select Create shortcut or Send to Desktop commands, a shortcut of the same folder, file or drive will be created in the Desktop and it will exhibit the filename along with the Shortcut word (prefix) at its end. You can add or remove it.

You need to download .bat file to either add or remove the Shortcut word after the afresh created shortcuts.

Remove Shortcut word after File

• Click the below link and download the file.

• Try to save the .bat file in an easily navigated location.
• Get to the location where you have saved it and double click on the .bat file.
• Now, your screen will blink. Create a new shortcut and you can see the Shortcut name extension is turn on.

Note: This is turned on by default.

Add Shortcut word after File

• Download the .bat file from the following link.

• Go to the downloaded file and double click the .bat file.
• Here also your screen will blink. Create a new shortcut to see if the Shortcut name extension is still on or not.

Note: The changes are applied to the shortcuts created after turning on or off the Shortcut name extension. Shortcut name extension of the shortcuts created prior to the change will not be affected.