I forgot to push changes, and it's been a while. I'm pretty sure this is game fixes.

tests/umu_backend_tests.sh

@@ -23,6 +23,10 @@ printf '%s|%s|%s|%s\n' "$WINEPREFIX" "$GAMEID" "${STORE:-}" "$*" >> "$UMU_STUB_L
 if [[ "${1:-}" == "" ]]; then
     mkdir -p "$WINEPREFIX/drive_c"
 fi
+if [[ "${1:-}" == "winetricks" && "${3:-}" == "already-installed" ]]; then
+    printf "winetricks verb 'already-installed' is already installed\n" >&2
+    exit 1
+fi
 STUB
 chmod +x "${testRoot}/bin/umu-run"
 
@@ -90,6 +94,13 @@ test_add_umu_launcher_records_backend_and_game_id() {
     assert_file_contains "$configFile" 'umu|c:\Program Files (x86)\GalaxyLaboratory\ShadowRine_FullVoice\play_sr.exe|Shadow Line|export umuGameId=shadow-line' "UMU launcher entry is recorded"
 }
 
+test_add_umu_launcher_records_extra_environment_flags() {
+    get_umu_bottle "entombed"
+    game="Entombed"
+    add_umu_launcher "entombed" 'c:\Program Files (x86)\Entombed\Entombed.exe' "export PROTON_USE_XALIA=0"
+    assert_file_contains "$configFile" 'umu|c:\Program Files (x86)\Entombed\Entombed.exe|Entombed|export umuGameId=entombed|export PROTON_USE_XALIA=0' "UMU launcher entry records extra environment flags"
+}
+
 test_run_umu_game_uses_converted_path() {
     get_umu_bottle "shadow-line"
     mkdir -p "${WINEPREFIX}/drive_c/Program Files (x86)/GalaxyLaboratory/ShadowRine_FullVoice"
@@ -113,8 +124,16 @@ test_install_crlf_file_normalizes_line_endings() {
     fi
 }
 
+test_install_proton_winetricks_verb_ignores_already_installed() {
+    get_umu_bottle "shadow-line"
+
+    install_proton_winetricks_verb "already-installed"
+}
+
 test_get_umu_bottle_sets_environment
 test_add_umu_launcher_records_backend_and_game_id
+test_add_umu_launcher_records_extra_environment_flags
 test_run_umu_game_uses_converted_path
 test_install_crlf_file_normalizes_line_endings
+test_install_proton_winetricks_verb_ignores_already_installed
 printf 'UMU backend tests passed\n'