Home » System Files, C » CI

Basic information about CI file

When there is a problem with opening files with the file extension CI（*.CI or *.ci）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the CI file yourself.

There are 4 file types using the CI file extension in our database. In the further part of this page, you will find detail information about all the CI file with their brief description and a list of programs that support CI file sorted by operating systems. The table below provides useful information about the CI file extension. It answers questions such as:
  • What is the CI file?
  • How to open a CI file?
  • What programs do I need to open a CI file?
  • What programs help to create and edit a CI file?
  • How to convert CI files to another file format?
  • How to convert another files to CI file format?


1.Detail information about CI file extension: Windows Content Indexer Catalog File

File type Windows Content Indexer Catalog File Category System Files
Developer Microsoft File format Binary
Description CI file is a Windows Content Indexer Catalog File developed by Microsoft. Operating system search file used by Windows 2000 and later; saves an index of search information that Windows uses to display results for file system searches; may be large in file size due to the amount of search information.
Software programs that will open, edit or convert CI files

Windows		 Microsoft Windows


2.Detail information about CI file extension: PolySpace Preprocessed Code File

File type PolySpace Preprocessed Code File Category Developer Files
Developer The MathWorks File format Text
Description CI file is a PolySpace Preprocessed Code File developed by The MathWorks.
Software programs that will open, edit or convert CI files

Windows		 The MathWorks PolySpace


3.Detail information about CI file extension: Microsoft SharePoint Server 2007 Temporary File

File type Microsoft SharePoint Server 2007 Temporary File Category System Files
Developer N/A File format N/A
Description CI file is a Microsoft SharePoint Server 2007 Temporary File.
Software programs that will open, edit or convert CI files

Windows		 Microsoft SharePoint Server


4.Detail information about CI file extension: CitectSCADA Data

File type CitectSCADA Data Category Data Files
Developer N/A File format N/A
Description CI file is a CitectSCADA Data.
Software programs that will open, edit or convert CI files

Windows		 CitectSCADA



Can't open a CI file?

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

”Can't open this file: example.CI”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the CI extension without any issue.


Where I can download the application that support CI file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How to change file associations?

  • Right-click a file with the extension whose association you want to change, and then click "Open With".
  • In the "Open With" dialog box, click the program whith which you want the file to open, or click "Browse" to locate the program that you want.
  • Select the ”Always use the selected program to open this kind of file” check box.


Can I change the extension of CI files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a CI file?

The reasons for the lack of the ability to open a CI file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a CI file. If there is still something wrong, you might want to check:

  • Whether the CI file is damaged.
  • Whether the CI file is incorrectly linked in the registry entries.
  • Whether the CI file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the CI file format is incompletely.
  • Whether the CI file is infected.
  • Whether the drivers of the equipment used for opening a CI file are up to date.
  • Whether your computer has enough hardware resources to open a CI file.

If the CI file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.