With help from the architecture document, I have produced a Windows form-based C# decryptor program. Windows developers may gain some insight into Cryptomator internal file structure and encryption methodology by looking here.
Mind you, I am not a member of Cryptomator development team and also the program is not supported by the Cryptomator team. Hope someone finds it useful.
EDIT: This program has been updated to support version 7 vaults used in Cryptomator 1.5.x