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Use Another Program
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 |
Get a Universal File Viewer
When no other program will open your CTL file, universal file viewers like File Magic (Download) are here to save the day. These programs can open many different types of files, so if none of the above tips work, a universal file viewer is the way to go. Note that some files are not compatible with universal file viewers and can only be opened in binary format.
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1File types that are unsupported can be opened in binary format.
