I am a long time arturia customer but new to the Arturia forum.
The Sysex import seems to be broken with the latest versions (v2.5.x) of Prophet V. The last version where this works properly seems to be v2.0 (available at the download archives) but that one does not nclude a 64-bit plugin.
I had sent a Suopport request back in February (Case 158505) and they told they will take care which did not seem to happen until now.
Recently i replied to the email they sent in February but also no reply there.
This is the support message i had sent in February:
"Description: In the latest version of Prophet V (v2.5.3) there seems to be a problem with importing Prophet 5 or Prophet VS Ssex files.
When yoo click on e.g. "Pro 5 Sysex" in the import pop-up menu the only available file format to open is "*.provbank" which is the own format of Prophet V but it is not possible to select the Sysex file format.
Same happens for the Prophet VS Sysex files.
This could be observed in both the Standalone and VST mode (VST at Ableton Live 9 32-bit).
I got aware of this problem by a post at KVR. I had imported my Sysex files with an earlier version so did not notice this problem until now."
Ingo