Thanks for your answer, i test by adding this line to my vmx file and my VM:
myCompany.uuid = "toto"
It doesn't change anything. When i'm trying to get the serial number with a tool like dmidecode for exemple, it's always the same resulat i had something like:
VMWARE-56 4d 2b 7b aa 58 03 4a-d8 e3 ab 71 b4 41 bc ae
Problem is i'm using a tool that import the serial number of servers (hard and virtual) based on an agent on the server which run dmidecode (dmidecode -s chassis-serial-number). And we have problems if we have serials with spaces, so 'im looking for a solution to change this in order to delete spaces.