4 Easy Ways to Open CTL Files

We’ve all been there. You double-click on a file and it doesn’t open the way it should. It’s a common problem. Many file extensions can be opened by multiple programs, and many programs can open multiple file extensions. If you’re having trouble opening CTL files, here are some ways you might be able to make it work.

Use Another Program

Computer Woman

If you can’t view the CTL file by double-clicking it, try opening it in a different program. Some of the most popular programs for opening CTL files are Unknown Apple II File, EditPlus Cliptext File, and Visual Basic User-defined Control. Check out the developers’ websites, download one or more of these programs, then try to open your CTL file again.

Get a Clue From the File Type

One file extension can be used for multiple types of files. Knowing the type of file you have can help you find out how to open it. Most CTL files are categorized as Developer Files, which can be opened by numerous software packages. See if you have a program already installed on your computer that’s designed to open Developer Files. Hopefully, this program might also work with your CTL file.


You can find out which type of file your CTL file is by looking at the file’s properties. Just right-click the file icon and select “Properties” or “More Info.” On a Windows computer, the file type will be listed under “Type of File”; on a Mac, it will be under “Kind.”

Contact a Developer

Nobody knows more about file extensions than software developers. If you can’t open your CTL file using any of the usual programs, you can contact the program’s software developer and ask them for help. Find your program’s developer in the list below:

Software Developer
Unknown Apple II File found on Golden Orchard Apple II CD Rom
EditPlus Cliptext File ES-Computing
Visual Basic User-defined Control Microsoft Corporation
Setup Information Unknown
User Control Microsoft Developer
PDP-10 Batch Control File Microsoft Developer
Notes 5 Thesaurus IBM

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