.ADF File Extension

The Sage Group
File Type:
ACT! Data File

Having trouble opening .adf extension? Don't panic! This page explains what adf files are as well as suggests programs you may use to open adf files. You can download these programs through this page.

What is an ADF file?

Adf file extension has ACT! Data file type, developed by The Sage Group, which is associated with the "database files" category.

Typically generated by ACT! application, the file stores customer contact information, including their names, email addresses, etc.

.ADF files are saved together with the .ALF lookup file. The latter provides metadata essential for navigating, creating backups, and restoring the ACT! database. .ADF files may be saved in an archive inside ACT! database backups using the .BAK file extension. .ADF file are similar to .MDF files.

To learn how you can open the given file, read the information below.

adf file icon
The Sage Group
File Type:
ACT! Data File
Database Files

How to open ADF file?

Double click the adf file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .adf extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the adf extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the adf file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open ADF files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the adf file as well. Download Universal File Viewer for your OS.

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