We don't offer official support for RLP on Windows yet, but the 'basisTechRootDirectory' option should verify that its value is an absolute path when used with Windows services.
See SERVER-13463 and SERVER-14842 for similar bugs and fixes.
Relative path in config file for mongod.exe not working when installing window service
Relative path allowed for auditPath when installing as service on windows
kmip*File options should forbid relative paths when used with Windows services