CQT file format description

Many people share .cqt files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .cqt file can be edited, converted or printed with. On this page, we try to provide assistance for handling .cqt files.

1 filename extension(s) found in our database.

.cqt - Mail.dat Container Quantity Data

The CQT data files are related to PostalOne!. The CQT file is a Mail.dat Container Quantity Data. Mail.dat is the standard embraced by a significant portion of the mail production industry and the US Postal Service. Mail.dat is a relational database of nineteen "connected" files describing each characteristic that can exist within a mailing.

Data files
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Mail.dat Container Quantity Data related extensions:
VibePlayer Data
AIM Module
Oracle Enterprise Manager OMS Backup Data
Taverna v2 Workbench Workflow Definition
Shana Informed Filler Form Data
Calendar Commander v2 Event File

Naturally, other applications may also use the .cqt file extension. Even harmful programs can create .cqt files. Be especially cautious with .cqt files coming from an unknown source!

Can't open a .cqt file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .cqt file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cq, cqf, ct, qct, qt, sqt, xqt

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Scitex Continuous Tone
Silicon Graphics Iris Cliptexture
TIFF Contone File
Compiled SQR Script
Cheat Engine Cheat Table
CQUAL Configuration

Operating systems

DataTypes.net currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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DataTypes.net >> CQT file