>> ALF file

ALF file format description

Many people share .alf files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .alf file can be edited, converted or printed with. On this page, we try to provide assistance for handling .alf files.

1 filename extension(s) found in our database.

.alf - Act! Database Log

The ALF data files are related to ACT!. ALF file is an Act! Database Log File. ACT! by Sage is a customer relationship management (CRM) software application which is used to keep track of client and prospect details in a single database that can be shared by multiple users.

Data files
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Act! Database Log related extensions:
ACDSee Canvas Symbol Data
ACDSee Pro Database
ACDSee Canvas Sequence Set
ACD/Labs Dataset
ACL for Windows Data

Naturally, other applications may also use the .alf file extension. Even harmful programs can create .alf files. Be especially cautious with .alf files coming from an unknown source!

Can't open a .alf file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .alf file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

af, afl, aif, akf, al, alb, alc, ald, ale, alg, alr, alt, alv, amf, aof

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

SketchUp License FIle
Alpha Five Library
SWI-Prolog Quick Load File
Microsoft Dynamics AX Application Label Cache
Alphacam Laser VB Macro
Microsoft Dynamics AX Application Label Temporary File

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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