I executed find in the Moment while Steam finished (so it could be that there is one file missing):
find
.
./launcher
./launcher/cs-cz
./launcher/cs-cz/arma3launcher.resources.dll
./launcher/cs-cz/SharedResources.resources.dll
./launcher/de-de
./launcher/de-de/arma3launcher.resources.dll
./launcher/de-de/SharedResources.resources.dll
./launcher/en-us
./launcher/en-us/arma3launcher.resources.dll
./launcher/en-us/SharedResources.resources.dll
./launcher/es-es
./launcher/es-es/arma3launcher.resources.dll
./launcher/es-es/SharedResources.resources.dll
./launcher/fr-fr
./launcher/fr-fr/arma3launcher.resources.dll
./launcher/fr-fr/SharedResources.resources.dll
./launcher/it-it
./launcher/it-it/arma3launcher.resources.dll
./launcher/it-it/SharedResources.resources.dll
./launcher/pl-pl
./launcher/pl-pl/arma3launcher.resources.dll
./launcher/pl-pl/SharedResources.resources.dll
./launcher/pt-br
./launcher/pt-br/arma3launcher.resources.dll
./launcher/pt-br/SharedResources.resources.dll
./launcher/ru-ru
./launcher/ru-ru/arma3launcher.resources.dll
./launcher/ru-ru/SharedResources.resources.dll
./addons
./addons/languagemissions_f_beta.pbo.a3.bisign
./addons/languagemissions_f_epa.pbo.a3.bisign
./addons/languagemissions_f_epc.pbo.a3.bisign
./addons/language_f_beta.pbo
./addons/languagemissions_f_bootcamp.pbo
./addons/languagemissions_f_beta.pbo
./addons/languagemissions_f_bootcamp.pbo.a3.bisign
./addons/languagemissions_f_epa.pbo
./addons/languagemissions_f_epc.pbo
./addons/languagemissions_f_gamma.pbo
./addons/languagemissions_f_gamma.pbo.a3.bisign
./addons/language_f_bootcamp.pbo.a3.bisign
./addons/languagemissions_f_epb.pbo
./addons/languagemissions_f_epb.pbo.a3.bisign
./addons/language_f_beta.pbo.a3.bisign
./addons/language_f_bootcamp.pbo
./addons/language_f_epb.pbo
./addons/language_f_epb.pbo.a3.bisign
./dta
./dta/languagecore_f.pbo
./dta/languagecore_f.pbo.a3.bisign
./mark
./mark/addons
./mark/addons/languagemissions_f_mark.ebo.a3.bisign
./mark/addons/language_f_mp_mark.ebo.a3.bisign
./mark/addons/language_f_mp_mark.ebo
./mark/addons/languagemissions_f_mark.ebo
./arma3_manual.pdf
Edit: compared with an backup using meld, it tells the same.