WinMail Decoder Pro is a quick and practical way to extract the contents of the texts of the emails, as well as the attached files they have, directly from the Winmail.dat file (where all the emails you receive are stored by default).
Really, WinMail Decoder Pro comes equipped with two programs: one, to be run in MSDOS, and another, for Windows. From the WinMail Decoder Pro interface you can scan and search the content of each of the emails received (they are saved in RTF format) and so, you can access, in decoded form, each one of them.
As for the data found, WinMail Decoder Pro allows saved on your hard drive.
You can free download WinMail Decoder Pro 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.