How to mount the stresslinux cloop image

[meijo]

I tried to mount the cloop image (I assume it is one) of the ISO distribution with the following commands:
losetup /dev/loop1 /mnt/stresslinux-read-only.i686-0.4.111
mount -o ro /dev/loop1 /mnt/loop1

However, i am asked to use a specific filessystem type.
Could you please provide me th fs type and tell me how this cloop image was generated?
Actually, I try to use to extract all files of the filesystem in order to set up a new PXE loadable version. Unfortunately, I had an issue loading the version 0.3.1 due to an issue with the console implementation.

Could you please help me with that? thanks.