If fciv is in C:\Windows, you can run it from anywhere. In that case,
fciv [____.exe] -sha1 --> Will run fciv on the file in question (____.exe = full file path)
If not,
cmd /K "cd /d c:\WINDOWS\" --> Will create a cmd window at the C:\Windows directory (replace c:\windows with the folder housing gpg4win-2.2.1)
fciv gpg4win-2.2.1.exe -sha1
When I typed
cmd /K "cd /d c:\WINDOWS\" into the Command Prompt and
C:\Users\username> changed into
C:\Windows> in the Command Prompt. However, typing all those recommended commands
fciv gpg4win-2.2.1.exe -sha1 and
fciv gpg4win-2.2.1.exe -md5 yielded the same error message as before; "
fciv is not recognized as an internal or external command, operable program or batch file."