Compare file if it identical or not

I would like to compare file if it identical or not.

I dont want to compare it by comparing byte by byte.

I'm thinking to use MD5 for this. Is this a good idea?

Something like:

$file = "c:\windows\regedit.exe"
$filedate = FileGetTime ($file)
$filesize = FileGetSize ($file)
$filecheck = $file1 & $filedate & $filesize
 
$md5 = _Crypt_HashData($filecheck, $CALG_MD5)
 
If $md5 <> $filecheck2 then
   msgbox(0,"","File is different")
Else
  msgbox(0,"","File is same")
EndIf

$filecheck2 also calculate using the same method.

Is this a good method?