.0 File Extension

A 0 file is a link file used by Linux operating systems. It contains a reference to a particular version of the library, which may have an extension such as ".0.0.0" or ".0.0.1," depending on the library version. 0 files allow multiple versions of library files to exist while only one of them is referenced and used by the operating system's dynamic library loader.

The library linking convention helps users and the operating system avoid situations where many implementations of the same library interface are loaded at the same time.

NOTE: The ".0" extension may also refer to an actual shared library and not a link file. Both shared libraries and shared library link files may also use extensions such as ".1," ".2," and ".3." For example, the following are valid extensions: .SO.0, ".so.1," ".so.2," and ".so.3."

First part of a split archive created with Hacha, a file archive splitting utility; supports various types of file compression and adds a number the end of each filename; i.e. "archive.zip.0," "archive.zip.1," "archive.zip.2," etc.

Hacha is written in the Spanish language (Hacha means "Axe" in English).

File saved by the M3 DS Real, a multipurpose game cartridge for the Nintendo DS; can store games, movies, and music that can be played on the NDS; automatically created when a game is loaded from the M3 DS Real for the first time; can also be saved manually like a regular game cartridge.

Data can be transferred to an M3 DS Real cartridge by connecting the cartridge to a PC via USB and dragging files to it like a hard drive or flash memory device.

Course.0 is an incomplete Mario Kart Wii level file that was mistakenly included in the final version of the game. It contains an uncompressed prototype of the Bowser's Castle course included in Mario Kart Wii. Course.0 is not playable within Mario Kart Wii, as it is not saved in the compressed .KMP format Mario Kart Wii uses to load courses.

Intrepid Mario Kart Wii modders found course.0 within the game's koopa_course.szs file. This unusual file was saved in a format not used by any of Mario Kart Wii's other files. The modders soon discovered that the file included an early version of the game's Bowser's Castle racetrack, which had been created in 2007 and not deleted before Mario Kart Wii shipped in 2008.

Modders analyzed course.0 to further their knowledge of how Mario Kart Wii racetracks are developed and created. Some even attempted to convert course.0 into a usable Mario Kart Wii course.

Because course.0 is an incomplete Mario Kart Wii course that is not saved in the KMP file format, it cannot be opened or played in Mario Kart Wii. You can, however, open course.0 in a text editor to view the XML data it contains.

A 0 file is an Android digital certificate. It contains credentials used to verify a website, network, or application's identity and authenticity. You can install 0 files at the user level on any Android device, but you can install 0 files at the system level on only rooted Android devices.

Devices, networks, websites, and applications use digital certificates, issued by certificate authorities (CAs), to identify themselves to each other and confirm you are transmitting information between trusted parties. Sometimes, websites, networks, and applications will require you to download and manually install a digital certificate, so you can securely exchange information.

On Android, some digital certificates are saved as 0 files (others are saved as .CRT, .P12, or .PFX files). 0 files can be installed at the user level or the system level, which determines whether all Android apps trust the certificate by default. However, to install a 0 file at the system level, you must possess a rooted Android device and manually move the 0 file to your device's system/​etc/​security/​cacerts directory. In most cases, you can simply install 0 files at the user level, and the apps that require that certificate will function correctly.

To install a 0 file at the user level on Android:

1. Place the 0 file on your Android device's SD card.
2. Open your device's Settings app and select Security → Encryption & Credentials.
3. Select Install from storage.
4. Select CA Certificate.
5. Click through the warning message Android displays.
6. Navigate to and select your 0 file.

Android's certificate manager will open, allowing you to install your certificate.

After you install a 0 file, Android will automatically delete the file from its current location and place it in the data/​misc/​user/​0/​cacerts-added directory.