Files with dtd file extension could be in the past found as configuration files for ICQ 6 Instant Messenger.

There are 4 other file types using
the DTD file extension!

empty icon.dtd - Document Type Definition format

empty icon.dtd - ArcView UNIX Hyperhelp supporting data

empty icon.dtd - 2D Design drawing

dtd icon.dtd - Orgadata LogiKal file

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DTD file extension - ICQ 6 settings

What is dtd file? How to open dtd files?

File type specification:

Settings, options, themes or skins file type icon Settings, options, themes or skins file type

dtd file icon: dtd filetype icon

The dtd file extension is also reported to be used for sort of settings/configuration files for ICQ 6 instant messaging program. Most likely obsolete format. Can be edited with any text editor.

This dtd file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

The default software associated to open dtd file:

ICQ icon

ICQ LLC logoICQ  Microsoft Windows software

Company or developer:
ICQ LLC

ICQ is very popular instant messaging protocol and client in middle and eastern Europe used for chatting, file transferring and video conferencing. It is available for Microsoft Windows, Linux, Mac OS X, iOS, Android and other operating systems.

ICQ for Mac icon

ICQ LLC logoICQ for Mac  Apple macOS / Mac OS X software

Company or developer:
ICQ LLC

ICQ is very popular instant messaging protocol and client in middle and eastern Europe used for chatting, file transferring and video conferencing. It is available for Microsoft Windows, Linux, Mac OS X, iOS, Android and other operating systems.

ICQ for Linux icon

ICQ LLC logoICQ for Linux  Linux/Unix software

Company or developer:
ICQ LLC

ICQ is instant messaging protocol and client used for chatting, file transferring and video conferencing. It is available for Microsoft Windows, Linux, Mac OS X, iOS, Android and other operating systems.

Help how to open:

Use text editing tool to open *.dtd files.

How to convert:

Probably cannot be converted to anything else.

List of recommended software applications associated to the .dtd file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dtd file, edit dtd file, convert dtd file, view dtd file, play dtd file etc. (if exist software for corresponding action in File-Extensions.org's database).

Settings file type for software that use dtd file - ICQ 6 settings

Programs supporting the exension dtd on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for settings dtd file action.

Microsoft Windows:

Apple macOS / Mac OS X:

Linux/Unix:

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