To avoid “Unable to open log file” and “log.nsf: File does not exist” errors remember to always start Powershell in “Run as Administrator” mode.
In newer versions like Microsoft Windows Server 2012 R2, navigate to the Domino binary directory and then prepend “.\” (without the quotes and with now spaces) before the traditional nwhatever.exe
For example, when binaries are at c:\lotus\domino and you want to run a copy-style compact on the entire data directory…
Start Powershell in “Run as Administrator” mode and your command line will look like this:
PS C:\lotus\domino> .\ncompact.exe -c