Varieties of AHD Files

Principal AHD Type

.AHD

File Name:	.ahd
Class:	Dynamics AX Online Help Data File

On-line help file associated with Microsoft Dynamics AX, an enterprise resource planning software for Microsoft Windows.

Programmer:	Microsoft Corporation
Class:	Data Files
Key:	HKEY_CLASSES_ROOT\.ahd

Software Programs That Open The Dynamics AX Online Help Data File:

Microsoft Dynamics AX by Microsoft Corporation

Windows

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Troubleshoot AHD Files

Common Problems Opening AHD Files

Microsoft Dynamics AX Not Present

When trying to open your AHD file, you get the error "Can't Open AHD File Type". Usually, this is because you do not have Microsoft Dynamics AX for %%os%% installed. The OS won't know what to do with your AHD file, so double-clicking to load the file doesn't work.

Tip: If you don't have Microsoft Dynamics AX installed, and you know of another program to open your AHD file, you can try opening it by selecting from the programs listed under "Show Apps".

Wrong Version of Microsoft Dynamics AX is Installed

It is possible that your version of Microsoft Dynamics AX isn't able to open your Dynamics AX Online Help Data File file due to incompatibility. If you've got the wrong version of Microsoft Dynamics AX installed, you'll need to install the correct version. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

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

Ultimately, most of the difficulties opening AHD files are due to having the wrong version of Microsoft Dynamics AX installed.

Other AHD File Issues

In the majority of cases, installing the right version of Microsoft Dynamics AX will resolve your issue. There can be other issues - unrelated to software - preventing you from opening AHD files. Other contributing causes:

• AHD file references in the Windows Registry are broken
• The AHD file description within the Windows Registry was removed
• Microsoft Dynamics AX or another AHD application experienced a flawed installation
• AHD file corruption
• Your AHD has adversely impacted by malware
• Drivers associated with AHD software need to be updated
• Windows has inadequate resources to open your Dynamics AX Online Help Data File file