>> ALT3 file

ALT3 file format description

Many people share .alt3 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .alt3 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .alt3 files.

1 filename extension(s) found in our database.

.alt3 - Adobe PageMaker for Mac Template

The ALT3 data files are related to Adobe PageMaker. The ALT3 file is an Adobe PageMaker for Mac Template. Adobe PageMaker is a decent desktop publishing software program if you want to create a simple desktop publishing publication like a newsletter or a catalog.

Adobe PageMaker
Data files
- / -
alt4, alt5
Adobe PageMaker for Mac Template related extensions:
Oracle-to-MySQL Profile Description Data
Adobe Photoshop for Mac Commands and Plugins Data
Cubase VST Arrangement Data
Adobe Photoshop Lightroom Toolkit Data
Perfect Effects Enhance Data
Korg Kontrol Editor Scene Data

Naturally, other applications may also use the .alt3 file extension. Even harmful programs can create .alt3 files. Be especially cautious with .alt3 files coming from an unknown source!

Can't open a .alt3 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 .alt3 file extension is often given incorrectly!

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

al3, alt, at3, lt3

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Microsoft Dynamics AX Application Label Temporary File
Acord AL3 Data
ReliaSoft ALTA Data
Sony ATRAC3 Compressed Audio
Corel WordPerfect Menu Library
Steam ALT Data

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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If you have useful information about the .alt3 file format, then write to us!