C:\Program Files (x86)\stunnel>stunnel-msspi-cli.exe -install
[ ] Running on Windows 6.2
[ ] No limit detected for the number of clients
[.] stunnel 5.48 on x86-pc-msvc-1900 platform
[.] Compiled/running with OpenSSL 1.0.2o 27 Mar 2018
[.] Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,OCSP,PSK,SNI
[ ] errno: (*_errno())
[ ] Running on Windows 6.2
[.] Reading configuration from file -install
[!] Cannot open configuration file
[.]
[.] Syntax:
[.] stunnel [ [-install | -uninstall | -start | -stop | -reload | -reopen | -exit] [-quiet] [<filename>] ] | -help | -version | -sockets | -options
[.] <filename> - use specified config file
[.] -install - install NT service
[.] -uninstall - uninstall NT service
[.] -start - start NT service
[.] -stop - stop NT service
[.] -reload - reload configuration for NT service
[.] -reopen - reopen log file for NT service
[.] -exit - exit an already started stunnel
[.] -quiet - don't display message boxes
[.] -help - get config file help
[.] -version - display version and defaults
[.] -sockets - display default socket options
[.] -options - display supported TLS options
[ ] Deallocating section defaults