windows - How to prevent WiX from removing registry keys on patching -


i making patch using "wix only" method. is:

torch -p -xi old.wixout new.wixout -out differences.wixmst

pyro patch.wixmsp -t mypatch differences.wixmst -out patch.msp

we write product key registry when install product. user prompted, part of installation, enter product key.

when run patch, works fine removes product key registry. other installed registry keys remain; key added part of initial install removed.

is there way create patch in way doesn't remove registry key?

i can't 100% sure, sounds have made change in same feature registry key. believe cause windows installer 'repair' whole feature, , part of has decided remove registry key.


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