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for completeness I add that on the same machine there is Acrobat DC masked with Fslogix. If I run on the .fdf file right click> open it works fine.

Sort out your FTA using setuserfta.exe tool. details are in my blog here https://ninaronline.co.uk/2020/05/01/adobe-acrobat-dc-on-citrix-non-persistent-rdsh-vdi-with-fslogix-app-masking-a-walk-through/