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+# Raises the default open-file limit system-wide.
+#
+# The stock Linux default (1024, or ~4096 on some distros) is too low for
+# some modern games and other heavy-I/O applications — Wine/Proton's own
+# winediag channel explicitly flags "Too many open files" when this is
+# hit, which can manifest as a game silently failing to start with no
+# other visible error. Confirmed via a real Path of Exile 2 launch
+# failure that was resolved entirely by this change.
+#
+# Shipped as a drop-in (rather than editing limits.conf directly) so it
+# can be overridden or removed cleanly without touching a shared file.
+
+*    soft    nofile    524288
+*    hard    nofile    524288