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DET File Extension

The DET file extension was created by Sage and is also known as the Sage ACT! 5 Email Message. DET is classified as a Data Files and The format of this file type has not been determined yet. You can open DET files in Swiftpage Act! program.

Sage ACT! 5 Email Message File Type

Sage ACT! 5 Email Message File Type
Extension .det
Developer Sage
Popularity 5.0 (6 Votes)
Mime Type mime-type/not.available
Default Program Swiftpage Act!
Category Data Files
Format Not Available
Updated 7/1/2025

What is a DET File Type?

If an ACT email contains one or more attachments, each attached file is saved as a separate DET file. There are pointers to each associated DET file, which can be accessed by opening the original message. If an email contains three attachments, for example, it will be saved as four DET files - one for the message and three for the attachments.

ACT 5.0 to 6.0.2 uses the DET format. ACT 6.0.3 saves e-mail messages in .IMA format. It became the Swiftpage Act in 2013.

Free Online DET Tools & Apps

Access powerful and secure free online DET tools to convert, view, edit, merge, split, and compare DET files — all without installing any software. Our tools support the .DET (Sage ACT! 5 Email Message) file extension and run smoothly in any modern browser.

Select a tool below to explore features and manage your DET files directly from your device with ease.

DET Files Common Issues

There are few common issues with the Sage ACT! 5 Email Message .DET File Extensions while opening the .DET files on Windows and MacOs, we have solution to those issues such as:

Can't Open DET Files?

  1. You must have supported software programs installed for Sage ACT! 5 Email Message on your system such as Swiftpage Act!.
  2. Associate default Swiftpage Swiftpage Act! program for *.det (Sage ACT! 5 Email Message) files.

    Associate DET Default Program on Windows
    1. Right-click a *.DET (e.g example.det) file and click Open With.
    2. In the Open with dialog box, click Swiftpage Swiftpage Act! program Or click Browse to locate the program (*.exe) that you want.
    3. Select check box for Always use this app to open .det files.

All Platform Software Programs for DET File Extension

List of all softwares that can open the DET files on each platforms such as Windows, Mac, iOS, Linux, Web and Android, you may click the each software link for more details for other supported formats for each software and the verified direct download links for each software with complete lisensing details.

Microsoft Windows logo image Open DET File on Windows

Software License Developer
Swiftpage Act! image. Swiftpage Act! 17 for Windows Commercial Swiftpage
BloodshedSoftware Dev-C++ image. BloodshedSoftware Dev-C++ 000 for Windows Free BloodshedSoftware Dev-C Plus Plus

MacOs logo image - FileProInfo.comOpen DET File on Mac OS

Software License Developer

Linux logo image - FileProInfo.comOpen DET file on Linux

Software License Developer

Website logo image - FileProInfo.comOpen DET file on Web

Software License Developer

iOS logo image - FileProInfo.comOpen DET file on iOS

Software License Developer

Android logo image - FileProInfo.comOpen DET file on Android

Software License Developer

About Licensing

  1. Free Trial This software are often used for an attempt period, like 14 days, before requiring payment. Some trial versions have a reduced feature set.
  2. Free This software is liberal to use. Examples include open-source , freeware software, like free programs supported by advertising.
  3. Free+ This software is liberal to download and use, but contains in-app purchases (IAP) to unlock additional content or functionality.
  4. Paid This software must be purchased so as to use it. it's going to be offered as a perpetual license or ongoing subscription.
  5. Included with OS This software is bundled with an OS , like Windows, macOS, or Android.

DET file extension icon image.About DET - Sage ACT! 5 Email Message

FileProInfo is to help you understand about the Sage ACT! 5 Email Message with *.DET suffix, and provide the complete detail as how to open, edit, convert, merge, split and compare it with other related software programs, software download links and free online apps and tools.

Our professional team members at FileProInfo have been individually researched and verified the details for DET. We want to be 100% accurate and publish the information about file formats, tools, apps and software programs that we have tested and validated.

If you would like to suggest any additions or updates to this page for DET, please let us know.

Updated 7/1/2025