Clean target deletes my source files

With MDK 4.23, when I create a new project (any NXP proc) with just a startup.s, after it builds fine, when I do a 'clean target' uVision kills my source file startup.s
I tried in various directories, with multiple modules .. anytime I do a clean target, all my source files get killed.

Existing example projects work fine.

Anyone any idea?

Jack

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