Types of AC Files

Principal AC Type

.AC

File Format:	.ac
File Type:	Autoconf Script

AC stands for Automatic Configuration.The AC file is an automatic configuration script produced by GNU Autoconf.The AC file automatically configures software source code packages to adapt to several types of Posix-like systems.The AC file is created by testing a software package for each feature the program might need in order to run a specific system.

Company:	GNU Operating System
File Category:	Executable Files
Subkey:	HKEY_CLASSES_ROOT\.ac

Software Programs That Open The Autoconf Script:

GNU Autoconf by GNU Operating System

Linux

Other AC Descriptions

.AC

File Format:	.ac
File Type:	AC3D 3D File

The AC file format is also used by AC3D.The AC file contains 3D resources such as meshes, texture paths, UV-mappings, and material definitions.

Company:	Inivis
File Category:	3D Image Files

Software Programs That Open AC3D 3D File Files:

Blender by Blender Foundation

Compatible with:

Windows

Mac

Linux

Inivis AC3D by Inivis

Compatible with:

Windows

Mac

Linux

X-Plane by Interscape

Compatible with:

Windows

Mac

Linux

.AC

File Format:	.ac
File Type:	CaseWare Working Papers Client Data File

Client data file created by CaseWare Working Papers, a project management software that allows user to conduct assurance and reporting engagements.

Company:	CaseWare International Inc.
File Category:	Data Files

Software Programs That Open CaseWare Working Papers Client Data File Files:

CaseWare Working Papers by CaseWare International Inc.

Compatible with:

Windows

.AC

File Format:	.ac
File Type:	ACwin Project File

Project file created in ACwin, a modeling software used to model and calculate facilities branched to supply compressed air.

Company:	Procedimientos-Uno, S.L.
File Category:	CAD Files

Software Programs That Open ACwin Project File Files:

ACwin by Procedimientos-Uno, S.L.

Compatible with:

Windows

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AC Troubleshooting

Common Problems Opening AC Files

GNU Autoconf is Not Installed

You attempt to load your AC file and get an error such as "%%os%% Can't Open The AC File Extension". When this happens, it is commonly due to GNU Autoconf missing in %%os%%. Your operating system cannot associate your AC with GNU Autoconf, so double-clicking the file won't work.

Tip: If you have another software that you know opens AC files, you can select it by hitting the "Show Apps" button.

Outdated GNU Autoconf

Sometimes your installed version of GNU Autoconf won't support your Autoconf Script file. Installing the latest version of GNU Autoconf from GNU Operating System is recommended. This problem is predominately due to having a Autoconf Script file version that was created by a newer version of GNU Autoconf than what you have installed on your PC.

Tip: Find clues on the correct software version by right-clicking your AC file and clicking "Properties".

Conclusion: The majority of AC file opening issues are due to not having the correct GNU Autoconf version installed.

Other Causes of AC File Opening Problems

You can still experience errors opening AC files even with the latest version of GNU Autoconf installed on your PC. There can be external issues inside of %%os%% that are causing these errors when opening ACs. Issues that aren't software-related:

• Windows Registry AC file paths that are incorrect
• Corruption of the AC file description inside the Registry
• Defective install of a AC program, such as GNU Autoconf
• Your AC file is corrupted (issues with your Autoconf Script file itself)
• Malware-tainted AC file can't be opened
• Drivers associated with AC software need to be updated
• Your PC doesn’t have enough available resources to open the Autoconf Script file