| File Extension: | DET |
| File Type Description: | Sage ACT! 5 Email Message |
| File Type Developer: | Sage |
| Primary Associated Software: | Act! |
| Primary Software Developer: | Swiftpage, Inc. |
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The DET file extension is a Sage ACT! 5 Email Message file developed originally by Swiftpage, Inc. for Act!. Data from our web servers (annonymous users) show that DET files are most popular in China and are often used by Windows 10. Most of these users are running the Google Chrome web browser.
 | Act! by Swiftpage, Inc. |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .UNQ | Swiftpage, Inc. | Data Files | ACT! 3.0 Email Message Attachment |
| .FPT | Sage | Database Files | ACT! Data File |
| .RPN | Swiftpage, Inc. | Text Files | ACT! Report Data |
| .REL | Nintendo | Game Files | Relocatable Module File |
| .RPC | Synthrone | Page Layout Files | Rich Page Content Document |
| .DBF | dBase, LLC | Database Files | Database File |
| .GDB | Garmin | Database Files | GPS Database File |
| .HK5 | Swiftpage, Inc. | Database Files | ACT! Database File |
| .GLY | Microsoft Corporation | Data Files | Word Glossary File |
| .ALF | Swiftpage, Inc. | Database Files | ACT! Lookup File |
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