I wouldn't dare to hold my breath... I fear suffocation.
If you get an error, then this means that OpenMPT was unable to parse the structure of the SFZ files (so it didn't even try to load the sample data), so please provide that SFZ file (the associated samples are not required) so that I can see what makes the parser trip. OpenMPT's SFZ parser is rather strict about the syntax of SFZ files since they have no "magic bytes" by which such a file could be identified, so maybe it doesn't like some specific line of the file that is ignored by other players.
Shadow copies are turned off by default.Incorrect. In particular, shadow copies are always turned on for the system drive on fresh installations.