File Extension Database

Open CDOC File

CDOC file format is a data file used by a software product named CDox. They contain documents or files that have been encrypted and compressed for secure storage and transmission. The CDOC format belongs to the group of "Encrypted Files" extensions. It is primarily associated with the 'eID Smart Card' and 'DigiDoc' by RIHA, an Information System Authority from Estonia.

Operating CDOC Files

CDOC files are designed to be used with the CDox software itself. The software represents a standard Estonian format for encrypted documents. It can be downloaded from the official Estonian ID-card software website. Files with the extension CDOC are often a standard XML document, that has been packed and encrypted. They often can contain multiple original files.

Opening CDOC Files with DigiDoc

Another software that can operate CDOC files is called DigiDoc. This software is available for Windows, MacOS, Linux, and even the mobile platforms - iOS and Android. It's used for manipulation of files that are archived or encrypted using the .cdoc file extension. You can download DigiDoc from the official ID-software website.

Using CDOC with Open-eid

The open-eid software also supports the CDOC file format. This software supports digital signing with the Estonian ID-card. So, not only can it open CDOC files, but it also allows the signer to add more files to the CDOC container, and remove the files that are no longer necessary. Open-eid is an open-source software, which means that it is free to use, and the source code can be viewed and studied by anyone. It can be downloaded here on GitHub.

CDOC File Important Information

When dealing with CDOC files, it's necessary to have an appropriate software installed on the device to view, or manipulate them. Without a software like CDox, DigiDoc or open-eid, the operating system won't know how to open the CDOC file. Another vital thing to avoid is trying to open those files with random software, or renaming the extension as it can lead to data loss. Always make sure you use official resources and trusted software.

How Can I Open CDOC File on Windows

We researched and learned that the best way to open CDOC file is to find a CDOC file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a CDOC file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open CDOC file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as CDOC file opener then try to search online for "CDOC viewer", "application to open CDOC file" or "open CDOC file" queries in the search engine you like.
Install the application you found and check if it can open CDOC file

How Can I Open CDOC File on Mac OS

We recommend to find a CDOC file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a CDOC file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with CDOC file.
If you know the Mac OS application which can work as CDOC file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open CDOC file in it.
If you don't know the application which can open CDOC file then try to search for "CDOC viewer", "application to open CDOC file" or "read CDOC file" queries in the online search engine you like.
Install the application you found and check if it can read CDOC file

How Can I Open CDOC File on Android

If you downloaded a CDOC file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded CDOC file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "CDOC".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "CDOC viewer", "CDOC file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open CDOC File on iPhone or iPad

To open CDOC File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the CDOC file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "CDOC". This way you can find apps which can open CDOC files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "CDOC viewer" or "CDOC file" online in your favorite search engine.

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