Types of DQC Files

Principal DQC Type

.DQC

File Name:	.dqc
Class:	CP/M Disk Information Data

The file contains information for installed disks related to CP/M (Control Program for Microcomputers) operating system for IBM PCs.

Organization:	Open Source
Class:	Data Files
Folder:	HKEY_CLASSES_ROOT\.dqc

Software Programs That Open The CP/M Disk Information Data:

CP/M by Open Source

CPM

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Understanding DQC Issues

Troubles Opening DQC Files

CP/M Not Present

When you double-click your DQC file, you may see a dialog box from your operating system stating that it "Cannot Open This File Type". If this is the case, it's usually due to the fact that you do not have CP/M for %%os%% installed on your computer. This will prevent you from double-clicking to open the DQC file because the OS doesn’t know how to handle it.

Tip: Another DQC-related program can be selected to open the file by clicking "Show Apps" and finding the application.

Obsolete Version of CP/M

Occasionally, you might have an outdated version of CP/M installed that's incompatible with your CP/M Disk Information Data type. If you've got the wrong version of CP/M installed, you'll need to install the correct version. This issue mainly occurs when your CP/M Disk Information Data file was created by a newer version of CP/M than you have on your PC.

Tip: You can sometimes get hints about the right program version by right-clicking on the DQC file, selecting "Properties", and looking at the version information.

Summary: Not having the right CP/M version on your computer can cause problems opening DQC files.

Other DQC File Issues

In the majority of cases, installing the right version of CP/M will resolve your issue. There can be other issues - unrelated to software - preventing you from opening DQC files. These issues include:

• Invalid DQC file references in the Windows Registry (the "phonebook" of the Windows Operating System)
• Mistaken removal of the Windows registry DQC description
• Defective install of a DQC program, such as CP/M
• Something has caused file corruption of your DQC
• Malware-tainted DQC file can't be opened
• DQC-related hardware has device drivers that obsolete
• Insufficient system resources to successfully open CP/M Disk Information Data files