There is a good article how to mount vmfs, but on debian i had to install the package otherosfs.
After i installed this package, i got the following error:
root@debian:/tmp# vmfs-fuse image /mnt/vmBut: Do not worry about this error message. The image was mounted on /mnt/vm and accessible without any problem...
VMFS VolInfo: invalid magic number 0x00000000
VMFS: Unable to read volume information
Trying to find partitions