CT1 file format description

Many people share .ct1 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ct1 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ct1 files.

1 filename extension(s) found in our database.

.ct1 - Microsoft SMS Proposed Site Control Data

The CT1 data files are related to Microsoft Systems Management Server. The CT1 file is a Microsoft SMS Proposed Site Control Data. Microsoft's Systems Management Server is a comprehensive set of tools designed to aid system administrators in managing large scale deployments of Windows. SMS features an integrated centralized management scheme with support for heterogenious client environments.

Microsoft Systems Management Server
Data files
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Microsoft SMS Proposed Site Control Data related extensions:
Toxic Biohazard Presets Data
Apple Mac OS X Console Spin Report
Esko Automation Engine Job Sheet Data
Siebel Report Object Instance
Calendar Commander v2 Calendar Data
Egis Encrypted Excel XLSB Document

Naturally, other applications may also use the .ct1 file extension. Even harmful programs can create .ct1 files. Be especially cautious with .ct1 files coming from an unknown source!

Can't open a .ct1 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 .ct1 file extension is often given incorrectly!

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

c1, cf1, ch1, cr1, ct, ctl, ctw, dt1, ft1, st1, t1, tc1

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

EAGLE Autorouter Control Data
Male MRI Image
Visual Basic User Control Text
Progress OpenEdge Transaction Log
CRBasic Source
CTW Compressed File

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 >> CT1 file