raw files damaged a due a ram error

After some strange errors inside a vm I realized that a ram module was damaged, so I stopped the system, changed the module but when I try to mount the file with

mount -o loop -t ext2 vm-400-disk-1.raw tmp/

I got

mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

Do you know a software to try to recover data from raw files ?

Best regards
Fabio