ACX File Extension

What is ACX file?

ACX filename suffix is mostly used for Atari ST Program files. Atari defined the Atari ST Program format standard. Files with ACX extension may be used by programs distributed for Windows platform. ACX file format, along with 1509 other file formats, belongs to the Game Files category. The most popular program for handling ACX files is Gemulator, but users can choose among 3 different programs that support this file format.

Programs which support ACX file extension

Below is a table that list programs that support ACX files. Files with ACX suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

How to open file with ACX extension?

Problems with accessing ACX may be due to various reasons. What is important, all common issues related to files with ACX extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. We have prepared a listing of which will help you resolve your problems with ACX files.

Step 1. Download and install Gemulator

The most common reason for such problems is the lack of proper applications that supports ACX files installed on the system. The most obvious solution is to download and install Gemulator or one to the listed programs: FAST, SainT, STonX. The full list of programs grouped by operating systems can be found above. If you want to download Gemulator installer in the most secured manner, we suggest you visit website and download from their official repositories.

Step 2. Check the version of Gemulator and update if needed

If you already have Gemulator installed on your systems and ACX files are still not opened properly, check if you have the latest version of the software. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. If you have an older version of Gemulator installed, it may not support ACX format. The most recent version of Gemulator is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Associate Atari ST Program files with Gemulator

After installing Gemulator (the most recent version) make sure that it is set as the default application to open ACX files. The next step should pose no problems. The procedure is straightforward and largely system-independent

Change the default application in Windows

• Clicking the ACX with right mouse button will bring a menu from which you should select the Open with option
• Select Choose another app → More apps
• To finalize the process, select Look for another app on this PC entry and using the file explorer select the Gemulator installation folder. Confirm by checking Always use this app to open ACX files box and clicking OK button.

Change the default application in Mac OS

• Right-click the ACX file and select Information
• Proceed to the Open with section. If its closed, click the title to access available options
• Select Gemulator and click Change for all...
• Finally, a This change will be applied to all files with ACX extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the ACX file is complete and free of errors

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper ACX file. It is probable that the file is corrupted and thus cannot be accessed.

1. The ACX may be infected with malware – make sure to scan it with an antivirus tool.

If the ACX is indeed infected, it is possible that the malware is blocking it from opening. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. ACX file is infected with malware? Follow the steps suggested by your antivirus software.

2. Verify that the ACX file’s structure is intact

Did you receive the ACX file in question from a different person? Ask him/her to send it one more time. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. When downloading the file with ACX extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Some files require elevated access rights to open them. Log in using an administrative account and see If this solves the problem.

4. Verify that your device fulfills the requirements to be able to open Gemulator

The operating systems may note enough free resources to run the application that support ACX files. Close all running programs and try opening the ACX file.

5. Ensure that you have the latest drivers and system updates and patches installed

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with Atari ST Program files. It is possible that one of the available system or driver updates may solve the problems with ACX files affecting older versions of given software.

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