Scripting

this error is to check that each file is only installed once to any folder. it occurs usually in vendor msi's only where the installation has to take into account operating systems and installs 2 different versions of a file to the same folder

the only way that I know to resolve ICE 30

if your operating system will be supporting long file names which I guess it will then open the msi in ORCA and delete the short files names from the file table. this will generate more invalid ICE 03 errors delete these as well
thats how I got rid of all my ICE 30 errors

mostly in the case of the vendor MSI the two components which are installing the same name files have some installation conditions with them. For example one component may have a condition WINNT>500 and the other may have WINNT<500 i.e. to ensure that which component will get installed based on the operation system on which the MSI is going to be installed.

so in such a case only one of the components will match the install condition...so in such a case ICE 30 can be ignored as the files wont be getting installed twice at the same location

If the same file are installed by more then one component and these components are always installed then you could just delete the extra files so only one instance of the file is installed.