CAPNP File - opening and understanding

Did your computer fail to open a CAPNP file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CAPNP files.

What is a CAPNP file?

A .CAPNP file is a Cap'n Proto schema file. Through our analysis of CAPNP files, we know that one use of the format is Cap'n Proto schema. We have not yet described in detail what these files contain and what they are used for, but our team is working tiredlessly through thousands of file formats. We'd love hearing from you if you have information about the format.

How to open CAPNP files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CAPNP for different purposes.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Suggest another file format using extension CAPNP

While we know of one file format using the .CAPNP file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CAPNP file.