fix MC-268617

PATCHED.md

@@ -62,6 +62,7 @@
 | Basic    | [MC-224729](https://bugs.mojang.com/browse/MC-224729) | Partially generated chunks are not saved in some situations                                                                                    |
 | Basic    | [MC-231743](https://bugs.mojang.com/browse/MC-231743) | minecraft.used:minecraft.POTTABLE_PLANT doesn't increase when placing plants into flower pots                                                  |
 | Basic    | [MC-232869](https://bugs.mojang.com/browse/MC-232869) | Adult striders can spawn with saddles in peaceful mode                                                                                         |
+| Basic    | [MC-268617](https://bugs.mojang.com/browse/MC-268617) | Structures can't be saved if the game directory is named in a certain way                                                                      |
 
 ## Previously patched
 Bugs that this mod has patched but has been superseded by a vanilla update.

src/main/java/dev/isxander/debugify/mixins/basic/mc268617/FileUtilMixin.java

@@ -0,0 +1,20 @@
+package dev.isxander.debugify.mixins.basic.mc268617;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import dev.isxander.debugify.fixes.BugFix;
+import dev.isxander.debugify.fixes.FixCategory;
+import net.minecraft.FileUtil;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+import java.util.regex.Pattern;
+
+@BugFix(id = "MC-268617", category = FixCategory.BASIC, env = BugFix.Env.SERVER, description = "Structures can't be saved if the game directory is named in a certain way")
+@Mixin(FileUtil.class)
+public class FileUtilMixin {
+    @WrapOperation(method = "<clinit>", at = @At(value = "INVOKE", target = "Ljava/util/regex/Pattern;compile(Ljava/lang/String;I)Ljava/util/regex/Pattern;", ordinal = 1))
+    private static Pattern fixWindowsReservedFilename(String regex, int flags, Operation<Pattern> original) {
+        return original.call(".*\\.|(?:CON|PRN|AUX|NUL|CLOCK\\$|CONIN\\$|CONOUT\\$|(?:COM|LPT)[¹²³0-9])(?:\\..*)?", flags);
+    }
+}

src/main/resources/debugify.mixins.json

@@ -30,6 +30,7 @@
     "basic.mc224729.ChunkMapMixin",
     "basic.mc231743.FlowerPotBlockMixin",
     "basic.mc232869.StriderMixin",
+    "basic.mc268617.FileUtilMixin",
     "basic.mc30391.LivingEntityMixin",
     "basic.mc69216.ServerPlayerMixin",
     "basic.mc7569.RconConsoleSourceMixin",