>> ASU file

ASU file format description

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

1 filename extension(s) found in our database.

.asu - Toolbook Package Definition

The ASU data files are related to Toolbook. ASU file is a Toolbook Package Definition. ToolBook is an e-learning content development application developed and published by SumTotal Systems.

Data files
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Toolbook Package Definition related extensions:
MRMC Label Data
MRMC Rate Matrix Data
NxOgre HeightField Data
Windows Sytem File Check Data
MRMC State Rewards Data
MRMC Impulse Rewards Data

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

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

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

acu, aeu, as, ash, asi, asj, ask, asy, au, aus, qsu, su, xsu, zsu

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

AutoREALM Symbols
Asymptote Document
Xilinx CORE Generator Graphical Symbol File
ACUCOBOL-GT Compiled Program
Assembly Include File
UNICOM Sample User XML 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 .asu file format, then write to us!