Well, I don't really know how to open a .int file. As @Benjamin Thompson notes, .int is not a supported image type, but that's not to say that it's not just something common with an uncommon extension.
That said, the attached file is empty. Rather, it's a file full of nothing but 8.2kB of zeros. There's no header, no content, and no apparent structure. As such, I can't really use this for testing potential methods to open it. You might want to check whatever process you used to create the file.
