The file extension .etd belongs to one of two programs, the first being Adobe eBook Reader. eBook reader has been discontinued and its features included in the Standard Adobe Reader software beginning with version 9. Adobe Reader versions 8 and earlier do not have .etd support available, so users of these versions will need to upgrade to the newest version of Reader or download any previous version of eBook Reader in order to open .etd files. Adobe also publishes a software package called Digital Editions. With Digital Editions users can purchase, download, manage, publish, and read all of their digital media including .etd files.
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When an eBook is purchased from an online store, oftentimes the download will be a file called ebx.etd. This file is not the book itself, rather it is a transfer file that will instruct the Adobe software where to download the eBook file from. Users have reported downloading the ebx.etd file only to have Adobe Reader open to a gray screen and go no further. This is generally due to the operating system's settings not allowing files to automatically open after download. These settings can be changed or the user can open the file manually from Adobe's "File/Open" menu. It should be noted that EBX files usually expire within a day of the initial download. It is vital for users to open the ebx.etd before it expires or risk having to purchase the eBook a second time.
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More Info Regarding File Extension Etd
The .etd file is also used for DRM (Digital Rights Management) purposes, especially at major universities. Students have reported downloading digital works in .pdf format but being unable to read them because they are missing an Adobe plugin called AdobeDRM. This plugin must be downloaded and installed which will enable Adobe to retrieve the ebx.etd file and verify DRM rights. Unfortunately it appears as though this plugin is only available after a user signs in with a .Net Passport or Adobe ID. Those who are unwilling to obtain or use one of these IDs will be unable to utilize .etd files or PDFs with DRM protection.
eBooks that were downloaded and opened on one computer can be transferred to a second computer for viewing. However, it will be necessary for Adobe Reader or Digital Editions to be installed on the second machine, and the software to be registered using the same .Net Passport or Adobe ID as the first. It is recommended by Adobe that this be done prior to attempting to open the first eBook on the second machine.
The file extension should not be confused with Electronic Theses and Dissertations (ETD), a standard for publishing electronic media used by universities and colleges. It is not uncommon for these electronic files to be referred to as ETD files but carry the .pdf extension. Adobe's .etd extension is loosely related to the ETD standard so there is much room for confusion. Suffice it to say that any published digital media can utilize the .etd extension; it is not restricted to the Electronic Theses and Dissertations standard.
The ebx.etd file is written in XML and can be opened using any standard text editor or web authoring software, although editing the data serves no useful purpose. On the contrary, editing this file can make the data unusable by the Adobe software and force the user to obtain a new copy.
EpsilonTest is an Italian software product used for creating, evaluating, and administering tests and answers via a LAN (Local Area Network). Epsilon's .etd file is the data for the test material and can only be opened using the Epsilon software. No other details about this file are known.
