I've got `.cdr` file format (not *CorelDRAW* file), however I've trouble opening/burning it. I expect it to be the disk image. Here are the first few lines:

```
$ hexdump -C *.cdr | head
00000000  45 52 02 00 00 70 00 00  00 00 00 00 00 00 00 00  |ER...p..........|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000200  ...
$ hdiutil imageinfo *.cdr
hdiutil: imageinfo failed - image not recognized

```

In what kind of format is this file?

I've checked [Magic numbers in files](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) article on Wikipedia, but it's not listed there.