Having problems opening a CALLTO file?

We have programs that open, view or play your CALLTO files.

Opening CALLTO files

Did your computer fail to open a CALLTO file? We explain what CALLTO files are and recommend software that we know can open or convert your CALLTO files.

What is a CALLTO file?

Every day thousands of users submit information to us about which programs they use to open specific types of files.

While we do not yet have a description of the CALLTO file format and what it is normally used for, we do know which programs are known to open these files. See the list of programs recommended by our users below.

We are constantly working on adding more file type descriptions to the site - the current count exceeds thousand by far, and more information about CALLTO files will hopefully be added soon.

Software that will open, convert or fix CALLTO files

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

About File Extension CALLTO

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the CALLTO file format or software that uses files with the CALLTO suffix, please do get in touch - we would love hearing from you.

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What is a file extension?
A file extension is the characters after the last dot in a file name. For example, in the file name "winmail.dat", the file extension is "dat". It helps Windows select the right program to open the file.
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We help you open your file
We have a huge database of file extensions (file types) with detailed descriptions. We hand pick programs that we know can open or otherwise handle each specific type of file.
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Original downloads only
All software that we list on the file.org website is hosted and delivered directly by the manufacturers. We do not host the downloads, but point you to the newest, original downloads.