Hey Claudio,
I only copy-paste some files from a folder to the 1.3 folder, so some files CAN be forgetted. (maybe it is just me)
...
Is it possible to exclude the autodeletion property for some files?
No. The way to prevent deletion of files is to include *all* the files for every version within wyBuild.
Or there is something that could help me not to forget the file? (something like a message box: "hey, example.dll is in v.1.2 but NOT in v.1.3, are you sure you want to delete it?")
We could add a summary of the files added, changed, and removed after you build your updates. That way you could see what effect the update will have on the target computer. Would that be helpful?