Help to install Singular 4-1-2 on Windows 10

I tried to install Singular 4-1-2 on Windows 10, and this is what I did:
1) install cygwin (setup-x86.exe) with default settings (I just clicked next for all steps)
2) I download singular-4.1.2-1.tar to C:\cygwin folder then click on singular-4.1.2-1.tar and chosee extract here(C:\cygwin)

but when I open sygwin terminal windows and write Singular I got this:
-bash: Singular: command not found


Any help?

1.) check that /usr/bin/Singular.exe exists:
ls -l /usr/bin/Singular.exe
should give
-rwxr-xr-x hannes/None 12807182 2019-03-05 11:43 /usr/bin/Singular.exe
(espacially the x's in the beginning should be present)
(if not, the unpacking failed, or was at the wrong place)
2.) check if /usr/bin is in your PATH (on cygwin):
echo $PATH
3.) check if some dynamic library is missing:
ldd /usr/bin/Singular.exe
should not report
.... not found

Hope that helps,
Hans Schoenemann

Thank you for your help.