CK1 file format description
Many people share .ck1 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ck1 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ck1 files.
3 filename extension(s) found in our database.
.ck1 - Commander Keen Data File
The CK1 game data files are related to Commander Keen. The CK1 file is a Commander Keen Data File. Commander Keen is a series of video games developed by id Software in the early 1990s.
- Commander Keen
- Game Data files
- - / -
- ck2, ck3, ck4, ck5, ck6
- Commander Keen Data File related extensions:
.ck1 - ChessBase Tactics Key Data
The CK1 game data files are related to ChessBase. The CK1 file is a ChessBase Tactics Key Data. ChessBase is a personal, stand-alone chess database.
- Game Data files
- - / -
- ChessBase Tactics Key Data related extensions:
.ck1 - CARE-S InfoWorks Kjeldahl Nitrogen Detail Data
The CK1 data files are related to CARE-S. The CK1 file is a CARE-S InfoWorks Kjeldahl Nitrogen Detail Data. Computer-Aided Rehabilitation Program for Sewers (CARE-S) is a software program that supports efficiency in rehabilitation decisions.
- Data files
- - / -
- CARE-S InfoWorks Kjeldahl Nitrogen Detail Data related extensions:
- CARE-S InfoWorks User Defined Pollutant Detail Data
- CARE-S InfoWorks Defined Pollutant Detail Data
- CARE-S InfoWorks Biochemical Oxygen Detail Data
- CARE-S InfoWorks Chemical Oxygen Detail Data
- CARE-S InfoWorks Phosphorus Detail Data
- CARE-S InfoWorks Catchment Runoff Data
Naturally, other applications may also use the .ck1 file extension. Even harmful programs can create .ck1 files. Be especially cautious with .ck1 files coming from an unknown source!
Can't open a .ck1 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.
- Open Control Panel > Control Panel Home > Default Programs > Set Associations.
- Select a file type in the list and click Change Program.
The .ck1 file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
c1, ck, ckl, ckw, cl1, cm1, cu1, k1, kc1, sk1
Is it possible that the filename extension is misspelled?
Similar file extensions in our database:
- DISA STIG Checklist
- Klondike Collection Game Data
- PhotoLine 4 Curve Data
- DataFlex Index
- ChucK Source Code
- sK1 Vector Drawing
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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