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I am trying to modify a form submission template, because there is an annoying m5fbrp__25 mention if there is not any attached file.
I.E.:
Complete name: Mlle testeuse
Entreprise: neneapas
email: contact@test.com
Message: test 29
Attached file: m5fbrp__25

Do you see something wrong in my code?: (ok, i just have found... what was wrong..)
Here is the good code, working well:

Replace Attached file: {$fld_25}

with: Attached file:
{if $fld_25 == m5fbrp__25}
no attached file
{else}
{$fld_25}
{/if}