oodle_ver.exe is just for the libraries to know what library version the file is (drop any "oo2core_#_win64.dll" onto oodle_ver.exe will tell you the library version without looking manually with hex editor).
For game files to scan use "oo2scan_7_win64.exe" inside scanner folder from this link:
https://fileforums.com/showthread.php?t=102453
PS: With big files, it could take a while before the process starts. Simply drag&drop the file into "oo2scan_7_win64.exe".
You cannot know what library is used for the game if the game is not shipped with any oo2core library, but the release date of the game is a good start. However for newer titles I suggest starting with library v2.9.5 is a good idea (do not use library v2.9.6 at all because this library has a critical memory bug. This particullar library is just included for completition). If output/speed of processing is bad, increase or decrease library version until you find the matching library.