Machine independent COBOL object
File type: Source code and script file
An acu file extension is associated with the Machine independent COBOL object file format.
Found 2 different file type records with the same acu filename suffix.
File type category:
Source code and script file
Date updated: May 23, 2018
Record marked as obsolete and not updated for a long time.
The acu file extension is associated with COBOL machine independent object. COBOL is one of the oldest programming languages.
Its name is an acronym for COmmon Business-Oriented Language, defining its primary domain in business, finance, and administrative systems for companies and governments.
Use ACUCOBOL-GT to open *.acu object files.
Probably cannot be converted to other formats.
Software applications that can open acu files:
Microsoft Windows
Software applications that can edit acu files:
Microsoft Windows
Software capable of saving acu files:
Microsoft Windows
Software apps that create acu files:
Microsoft Windows
Software applications that handle other tasks involving acu files:
Microsoft Windows
File type category:
Archive and compressed file
Date updated: September 27, 2026
NuFX is a legacy archive format used with AppleLink, formerly known as AppleLink Personal Edition and later associated with America Online. ACU files package files into a compressed archive for storage or transfer.
The archive can contain files and the associated information needed by Apple II software. ShrinkIt is the archive utility associated with this format; the Windows version can extract the files from an ACU archive.
ACU is a legacy format and is mainly encountered in older AppleLink and Apple II software collections rather than in current file-transfer workflows.
On Microsoft Windows, open the ACU file with ShrinkIt. Start ShrinkIt and use its archive-opening or extraction function to view and unpack the contents.
Because ACU is a legacy archive format, current general-purpose archive programs may not recognize it.
There is usually no need to convert an ACU file itself. Extract its contents with ShrinkIt, then place the extracted files in a current archive format such as ZIP if they need to be shared with modern software.
Conversion to another archive format can remove Apple II-specific file information, so retain the original ACU file when that information matters.
Software apps that extract acu files:
Microsoft Windows
Language
