A ton of information of French use of flamethrowers during WWI. Nothing after that though. It seems the USA/USMC were the biggest users of it after WWI as a "MANPAC" system. Most other countries shifted to the Flame Tank as it had a greater range and dare I state the obvious, better protection. Vietnam both marked a resurgence of the "MANPAC" and it's end, as the M9A1-7 was replaced by the M202A1 Flame Grenade Launcher during the end of that war.
I found a couple of refs of a French ENERGA AT rifle grenade. However most sources in regards to the initial ENERGA 75mm grenade point to use only by Belgium, U.S., UK, South Africa also Rhodesia was mentioned many times as well. The answer will have to come from a reliable Pub. or French source. If I get an answer to another inquiry from the French MOD, I 'll push the envelope further on this question. The improved version below is the one I saw mentioned for French use a couple of times. The original ENERGA grenade was made between ~1950 - 1953. There were several users of the "Super" as well.
http://articles.janes.com/articles/J...e-Belgium.html
This ref. (From 1991.) if someone has it or an older or newer version would mercifully end our agony on this, but what's a little pain anyway!?! After all when I see my Dentist, she just drills away when required, I hate needles! Have a long day tomorrow, have a great week!
Regards,
Pat