The MP4 MIME-type is a video type that is mainly configured in IIS or Internet Information console. It is the one that instructs a web browser to use the default video application when running MP4 files from websites. MIME which stands for Multipurpose Internet Mail Extensions which offers a way to identify files on the Internet-based on their format and nature. For example, when a content-type header value like MP4 is defined in an HTTP response, the browser can be configured to open the file with the proper plugin. However, there are some servers that don’t have an associated MIME type to support MP4 files and so they fail to play these files. In such cases, you will encounter the “Unsupported video type or invalid file path” error, especially when you use the Internet Explorer browser in Windows 10. To fix this problem, you may have to configure the MP4 MIME type in IIS but you might find that IIS is not enabled in Windows 10 which is why you need to turn it on or enable it first. For more details, refer to the following instructions below.

Same as in previous Windows versions, Windows 11 will also use certain applications as default ones for opening certain file types and file extensions. And yes, same as in previous versions it will come preconfigured for certain file types and associated applications like for example photos for pictures.
Of course, users usually have their own favorite applications for certain file types and much more prefer to open them inside the application of their choice instead of the default one.
We can change the default application like in previous Windows versions but this time there are two ways and overall more control of this process. Windows 11 has settings for choosing default file type applications and default file extension applications giving you more control of this process.
Error Causes
Bug and security fixes:Windows 11 has come a long way from its infant stage. Today it is incredibly good and stable operating system that also looks good and modern. Unfortunately, fancy animations and good graphics come with a price, in this case, slower performance on some little older and weaker computers.

Animations itself which include also fading effects can sometimes feel slugging and laggy and have a general overall feeling of delay. For a more old-school instant experience, you can turn off animations.
In order to turn animations inside Windows 11 follow this simple guide:
First thing is to open Settings by pressing Windows + i key combination or you could open Start and in the search box type in Settings and then click on its icon.
Once inside settings on the left side find Accessibility and click on it to select it. Once it is selected on the right side choose Visual effects. Inside the visual effects section click on the switch next to Animation effects to OFF. You can also turn off transparency effects in this section if you wish if you have an older GPU in order to speed it up a little.
That is all you need to do, settings will be automatically saved and all animations will be turned off for a quicker and more responsive feeling when working inside W11
“This app wants to access your pictures” or “This app wants to access your account info”both of which are followed by two buttons that will ask you to Allow or Deny the action. You can always click on any of the given options. This will determine the permission of the application. Users in Windows 10 are given the option to either allow or deny applications in accessing their account information like name, picture and other account information. Thus, in this post, you will be guided on how you can change the Privacy settings of these apps to allow or deny them permission to access not just your account info but for all users, as well as specific apps in Windows 10. The user account information is part of the Privacy data in Windows 10 that you can control easily using the Settings app. In fact, you can revoke or grant access permission for your account information, all the users and specific applications to do that, follow each one of the instructions provided below carefully.
“Windows cannot start new hardware devices because the system hive is too large (exceeds the Registry Size Limit), (Code 49)”There are instances when it may so happen that the device or devices are no longer attached to the computer but they are still listed in the system hive of the registry. For instance, if you were removing hardware and application for years but they weren’t removed from the registry then the size of the system hive keeps on growing until it hits the maximum limit. As you know, making changes in the registry manually, no matter how knowledgeable you are on such things is not sage since the registry is not only important but also complex. In addition, the System Hive is also a permanent part of the Registry associated with a set of files that contain information related to the configuration of the computer on which the OS is installed. To resolve this error, you must remove or uninstall any hardware devices that are no longer in the system. In fact, the Device Manager hides them by default so you need to enable hidden or non-present devices. Follow the instructions given below to set the Devices Manager to display devices that are no longer connected to the computer. Step 1: Tap the Win + R keys to open the Run dialog box. Step 2: After that type in “cmd” and hit Enter to open the Command Prompt. Step 3: Type “set devmgr_show_nonpresent_devices=1” in the Command Prompt and hit Enter to enable the hidden devices option. Step 4: After that, exit Command Prompt and tap Win + X + M to open the Devices Manager. Step 5: After opening the Devices Manager, click on View and then select the “Show hidden devices” option. This will show you all the devices that are not connected to the computer but are still mentioned. Step 6: Next, select a non-present device and click Uninstall from the Driver tab. Step 7: After that, repeat what you’ve done on step 5 for any other device that you no longer use. Step 8: Restart your computer. You can check the device Properties dialog box in the Device Manager after you’re done removing all the useless devices, to check if the error is now fixed or not. Moreover, you can also try running the Hardware and Devices Troubleshooter as it can also help resolve hardware-related problems. To use it, refer to the steps below.
“The program can’t start because AVFoundationCF.dll is missing from your computer. Try reinstalling the program to fix this problem.” "This application failed to start because avfoundationcf.dll was not found.” "Cannot find %COMMONFILES%AppleApple Application Supportavfoundationcf.dll." "Cannot start AVFoundationCF. A required component is missing: avfoundationcf.dll.” “Avfoundationcf.dll Access Violation." "Cannot register avfoundationcf.dll."
Error Causes
REevil is one of the most active and successful hacking groups connected to Russia and operating all over the world. The group recently demanded a huge bitcoin ransom for an attack targeting IT firm Kaseya in the USA.
Since Tuesday blog and payment site run by REvil group cannot be longer reached without any kind of explanation or why.
The reason behind the disappearance is unknown but has sparked speculation that the group may have been targeted deliberately by authorities.
US President Joe Biden said he raised the issue with Vladimir Putin during a phone call on Friday, after discussing the subject during a summit with the Russian president in Geneva last month.
Mr. Biden told reporters that he had "made it very clear to him...we expect them to act" on information and also hinted the US could take direct digital retaliation on servers used for intrusions.
The timing of Tuesday's outage has sparked speculation that either the US or Russian officials may have taken action against REvil - though officials have so far declined to comment and cyber experts say sudden disappearances of groups are not necessarily uncommon.
The development comes after a series of high-profile ransomware attacks which have hit major US businesses this year.
The FBI accused REvil - also known as Sodinokibi - of being behind a ransomware attack on the world's largest meat processing company JBS last month.