.cdoc file: how to open it on Windows
2 Windows apps register the .cdoc extension. Install one of them to open the file with a double-click.
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DigiDoc4 ClientDigiDoc4 is an application for digitally signing and encrypting documents; the software includes functionality to manage Estonian ID-card - change pin codes etc.
- eID software
Use your ID-card electronically, digitally sign documents and encrypt documents for safe transfer.
Related guide: Change the default app for a file type in Windows