Yes, I think that's quite common way do deploy the libs on Windows.
The problem is that any other installation overwriting them with older versions could even prevent your application from launching. For example, let's say your application depends on new functions introduced in Qt 4.2 and some other installer overwrites the dll's with 4.1 ones.Wouldn't it make more sense to install them in c:/windows/system32?
Would it cause troubles when any other installer updates them?
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