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Registry files are in unicode and contain a x'FFFE' as the first 2 bytes.
Editing a .reg file and saving it with textpad removes that x'FFFE' prefix.
It is not possible to import that saved file into the registry.

Select
Configure | Preferences | Document Classes | <Class> | Write Unicode and UTF-8 BOM
or
View | Document Properties | Preferences | Write Unicode and UTF-8 BOM
.

Thank you for that useful information!

Maybe this should be default for registry files.
Or textpad should write back the BOM if it reads it in.

It may well be that it should. I wrote what is, not what ought to be.