What is a DDOC File?

How to Open, Edit, & Convert DDOC Files

Screenshot of a DigiDoc DDOC file icon

A file with the DDOC file extension is a DigiDoc Digital Signature file that stores encrypted data used with the DigiDoc software.

.DDOC is the file extension used in the first generation DigiDoc format, while the the latest version uses .BDOC and stands for a Binary Document file.

These DigiDoc formats were developed by RIA. You can read more about the DDOC, BDOC, and CDOC format used with DigiDoc on their DigiDoc File Formats page.

If not a DigiDoc file, your particular DDOC file may be a Digital Mars C, C++, or D macro file. Another possible format for your DDOC file may be a graphic file used with Apple's now-discontinued MacDraw software.

Note: Though they look awfully similar, DDOC files have nothing at all to do with ADOC files or Microsoft Word's DOC and DOCX file formats.

How To Open a DDOC File

DDOC files can be opened with DigiDoc.

Depending on the version of DigiDoc you're using, you may see an alert that reads "The current file is a DigiDoc container that is not supported officially any longer. You are not allowed to add or remove signatures to this container" when you try opening the DDOC file. Here's more on this error.

I'm not entirely sure how DDOC files work with them, but if yours isn't a DigiDoc file, then it's probably associated with Digital Mars compilers.

MacDraw was a vector drawing application released with Mac computers in 1984.

It evolved into MacDraw Pro and then ClarisDraw in 1993, but isn't available for download or purchase anymore. It's probably highly unlikely that your DDOC file has anything to do with MacDraw.

Tip: Your DDOC could be saved in a format that has nothing to do with any of the formats already mentioned here, in which case a totally different program is required to open it.

If you think this may be true for your DDOC file, try opening it with Notepad++ to see if there's any identifiable text that can help you understand what program was used to create the file. You can then use that information to research a DDOC viewer or editor.

If one program on your computer tries to open DDOC files but shouldn't, or you've accidentally associated these extensions with an unrelated program (like MS Word), changing this default "open with" application is easy. See How To Change File Associations in Windows for detailed instructions.

How To Convert a DDOC File

A free file converter is normally the way to go for converting one file format to another but I don't know of any converter tools that support any of these DDOC formats.

The only other way to convert a file is to use the software that opens it, via its save or export option. This might be possible with DDOC files that are used with Digital Mars software but I don't imagine that's also true for DigiDoc files.

More DDOC Format Help

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more.

Let me know what kinds of problems you're having with opening or using the DDOC file, what programs you've tried so far, and anything else that might be helpful and then I'll see what I can do to help.