I suppose you have the same case of win10 64 bits.
snippingtool.exe is a 32 bits application and located in c:\windows\system32.it cannot run on 64 bits.
running codes i gave ,search only 64bits application and it dont find the snippingtool.exe in
c:\windows\sysWOW64 (the default system folder)
then it returns error.it must oriented toward 32 bits.hardcoded c:\windows\system32 dont work in this case.
MS introduced a virtual folder "sysnative"
with 64 bits,these codes work as follow:

RUN /n c:\windows\sysnative\SnippingTool.exe  &&works

inke(4)

DECLARE INTEGER ShellExecute IN SHELL32.DLL INTEGER nWinHandle,;
                                            STRING cOperation,;
                                            STRING cFileName,;
                                            STRING cParameters,;
                                            STRING cDirectory,;
                                            INTEGER nShowWindow

result = ShellExecute(0, "open", "c:\windows\sysnative\snippingtool.exe","","",1)
messagebox(result,0+32+4096,'',1000)  &&works