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You don't have to do anything.What do I need to do with modified and modified,obsolete files?
Thank you for that and I understand what you are saying but I have to disagree.I`m sorry to disagree with with you, @pware, but that is NOT what Obsolete means. I have researched this. It means no more and no less than that it was mentioned in another asset`s "obsolete-table" section. See KIND TrainzBaseSpec for details. The page you linked to is incorrect.
This means that the selected asset has been updated by a newer version that is installed on your system. This qualifier label can appear on any assets such as Installed from DLS, Packaged, Built-in
A key-value list of assets which are made obsolete by this asset. Any attempt to load an asset referenced in this list will result in this asset being loaded instead. The assets referenced in this list must have the same creator as this asset. It is illegal for two assets to both mark a third asset obsolete, unless one of the two also marks the other as obsolete. Circular obsolete references are illegal. All lower-numbered KUID2 versions of this asset are implied as obsolete and need not be included in this list. It is illegal to mark a higher-numbered KUID2 version of this asset as obsolete as that creates an implicit circular reference.