Juan Pena said:
...What alternatives do I have? How should I proceed?
If I understand your post correctly, you are saying you must have the specific hardware USB device to even access the stored file?
Anything that makes you dependent on specific hardware, proprietary tools, or methods is generally speaking full of major limitations. However, in some cases one may find it desirable...such as using the hardware-based Trusted Platform Module. However, there are limitations in relying on TPM.
I'd use a more readily available "known good" software-based encryption program, and make sure it works with standard filesystems. In other words, it encrypts a "normal" file and saves it as a "normal" file suitable for the systems you plan to use...nothing fancy. That way, the encrypted file can be copied freely to any normal storage device (including the cloud) or even emailed as an attachment, without the encryption device/program being required to do so. It's only when someone actually has to use
the contents of the file that the decryption hardware and/or software tool is required.
There are numerous freeware tools available that can do that. Even Windows 7 and above (Bitlocker -note1)
provide decent strength and reliability encrypt/decrypt tools at that level. Some use normal encrypt/decrypt keys on a standard text file that can be read-from/stored by just about any operating system, others use steganography, and other methods.
Here are some alternatives if Windows built-in encrypt/decrypt facilities are unacceptable.
or do a global internet search on [file and hard drive encryption]
when using Bitlocker, if you get an "no TPM" error, you might try this procedure to bypass. To help people migrating from Truecrypt to Bitlocker, Truecrypt.org
provided this after they discontinued Truecrypt.
Data will still be strongly encrypted, it just won't provide the additional
security that depending on TPM hardware provides.