MSI only supports append with comma separator for INI values
The indicated INI value specifies an append installation action with a separator character that is not a comma. However, MSI always uses a comma to append INI values. This will probably cause problems.
Make sure that your application can tolerate a comma as the separator character for INI values if you are building an MSI installer. Alternatively, build an InstallMate installer instead.
InstallMate versus Windows Installer