Compatibility issue when upgrading/downgrading between vmware server 1.0.4 and vmware server 2.0

1. fix the vmware configuration file .vmx : change the line 'virtualHW.version = "6″' to 'virtualHW.version = "4″'.
2. fix the vmware disk configuration file .vmdk: change the line 'ddb.virtualHWVersion = "6″' to 'ddb.virtualHWVersion = "4″'.
3. if the .vmdk is large, you may not want to directly modify the file by opening it. You can use "dd "if=source.vmdk" | sed "/virtualHWVersion = \"6\"/s//virtualHWVersion = \"4\"/" > modified.vmdk". For windows users, you can use cygwin, or uedit32.exe.