diff --git a/src/main/java/gregtech/api/util/FileUtility.java b/src/main/java/gregtech/api/util/FileUtility.java
index c33e7135f18..7f6e82d2ede 100644
--- a/src/main/java/gregtech/api/util/FileUtility.java
+++ b/src/main/java/gregtech/api/util/FileUtility.java
@@ -146,11 +146,11 @@ public static void extractJarFiles(String resource, File targetPath, boolean rep
      * @return A String of the File name at the end of the file path
      */
     public static String trimFileName(String name) {
-        FileSystem fs = FileSystems.getDefault();
-        String separator = fs.getSeparator();
+        // this method is passed deposit names, which need to be converted first
+        name = slashToNativeSep(name);
 
         //Remove the leading "folderName\"
-        String[] tempName = name.split(Matcher.quoteReplacement(separator));
+        String[] tempName = name.split(Matcher.quoteReplacement(File.separator));
         //Take the last entry in case of nested folders
         String newName = tempName[tempName.length - 1];
         //Remove the ".json"
@@ -164,4 +164,22 @@ public static String trimFileName(String name) {
 
         return newName;
     }
+
+    /**
+     * Converts a path string from using the filesystem's native path separator to /
+     * <br>
+     * Useful for converting paths to consistent strings across operating systems
+     */
+    public static String nativeSepToSlash(String path) {
+        return path.replace(File.separatorChar, '/');
+    }
+
+    /**
+     * Converts a path string from using / to the filesystem's native path separator
+     * <br>
+     * Useful for allowing paths converted with {@link FileUtility#nativeSepToSlash(String)} to be used for file i/o
+     */
+    public static String slashToNativeSep(String path) {
+        return path.replace('/', File.separatorChar);
+    }
 }
diff --git a/src/main/java/gregtech/api/worldgen/bedrockFluids/BedrockFluidVeinHandler.java b/src/main/java/gregtech/api/worldgen/bedrockFluids/BedrockFluidVeinHandler.java
index 65028b0fe25..1de810721b0 100644
--- a/src/main/java/gregtech/api/worldgen/bedrockFluids/BedrockFluidVeinHandler.java
+++ b/src/main/java/gregtech/api/worldgen/bedrockFluids/BedrockFluidVeinHandler.java
@@ -2,10 +2,11 @@
 
 import gregtech.api.GTValues;
 import gregtech.api.GregTechAPI;
-import gregtech.core.network.packets.PacketFluidVeinList;
+import gregtech.api.util.FileUtility;
 import gregtech.api.util.GTLog;
 import gregtech.api.util.XSTR;
 import gregtech.api.worldgen.config.BedrockFluidDepositDefinition;
+import gregtech.core.network.packets.PacketFluidVeinList;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
@@ -286,7 +287,8 @@ public static FluidVeinWorldEntry readFromNBT(@Nonnull NBTTagCompound tag) {
             if (tag.hasKey("vein")) {
                 String s = tag.getString("vein");
                 for (BedrockFluidDepositDefinition definition : veinList.keySet()) {
-                    if (s.equalsIgnoreCase(definition.getDepositName()))
+                    // old save data can have deposit names with native separators, get rid of those
+                    if (FileUtility.nativeSepToSlash(s).equalsIgnoreCase(definition.getDepositName()))
                         info.vein = definition;
                 }
             }
diff --git a/src/main/java/gregtech/api/worldgen/config/BedrockFluidDepositDefinition.java b/src/main/java/gregtech/api/worldgen/config/BedrockFluidDepositDefinition.java
index 4f351f0d7e8..cc8406b326d 100644
--- a/src/main/java/gregtech/api/worldgen/config/BedrockFluidDepositDefinition.java
+++ b/src/main/java/gregtech/api/worldgen/config/BedrockFluidDepositDefinition.java
@@ -77,7 +77,10 @@ public boolean initializeFromConfig(@Nonnull JsonObject configRoot) {
         return true;
     }
 
-    //This is the file name
+    /**
+     * Must be converted using {@link gregtech.api.util.FileUtility#slashToNativeSep(String)}
+     * before it can be used as a file path
+     */
     @Override
     public String getDepositName() {
         return depositName;
diff --git a/src/main/java/gregtech/api/worldgen/config/IWorldgenDefinition.java b/src/main/java/gregtech/api/worldgen/config/IWorldgenDefinition.java
index 3f7a53c6441..4a7765ec4fc 100644
--- a/src/main/java/gregtech/api/worldgen/config/IWorldgenDefinition.java
+++ b/src/main/java/gregtech/api/worldgen/config/IWorldgenDefinition.java
@@ -7,6 +7,10 @@
 public interface IWorldgenDefinition {
 
     //This is the file name
+    /**
+     * Must be converted using {@link gregtech.api.util.FileUtility#slashToNativeSep(String)}
+     * before it can be used as a file path
+     */
     String getDepositName();
 
     boolean initializeFromConfig(@Nonnull JsonObject configRoot);
diff --git a/src/main/java/gregtech/api/worldgen/config/OreDepositDefinition.java b/src/main/java/gregtech/api/worldgen/config/OreDepositDefinition.java
index d2b6c2a9558..73a65c0f86c 100644
--- a/src/main/java/gregtech/api/worldgen/config/OreDepositDefinition.java
+++ b/src/main/java/gregtech/api/worldgen/config/OreDepositDefinition.java
@@ -85,7 +85,10 @@ public boolean initializeFromConfig(@Nonnull JsonObject configRoot) {
         return true;
     }
 
-    //This is the file name
+    /**
+     * Must be converted using {@link gregtech.api.util.FileUtility#slashToNativeSep(String)}
+     * before it can be used as a file path
+     */
     @Override
     public String getDepositName() {
         return depositName;
diff --git a/src/main/java/gregtech/api/worldgen/config/WorldGenRegistry.java b/src/main/java/gregtech/api/worldgen/config/WorldGenRegistry.java
index ab2b8342588..ae548cf1239 100644
--- a/src/main/java/gregtech/api/worldgen/config/WorldGenRegistry.java
+++ b/src/main/java/gregtech/api/worldgen/config/WorldGenRegistry.java
@@ -248,8 +248,8 @@ public void reinitializeRegisteredVeins() throws IOException {
                 break;
             }
 
-            // Finds the file name to create the Definition with
-            String depositName = veinPath.relativize(worldgenDefinition).toString();
+            // Finds the file name to create the Definition with, using a consistent separator character
+            String depositName = FileUtility.nativeSepToSlash(veinPath.relativize(worldgenDefinition).toString());
 
             try {
                 // Creates the deposit definition and initializes various components based on the json entries in the file
@@ -279,8 +279,8 @@ public void reinitializeRegisteredVeins() throws IOException {
                 break;
             }
 
-            // Finds the file name to create the Definition with
-            String depositName = bedrockVeinPath.relativize(worldgenDefinition).toString();
+            // Finds the file name to create the Definition with, using a consistent separator character
+            String depositName = FileUtility.nativeSepToSlash(bedrockVeinPath.relativize(worldgenDefinition).toString());
 
             try {
                 // Creates the deposit definition and initializes various components based on the json entries in the file
@@ -423,7 +423,7 @@ else if (targetPath.compareTo(extractLockPath) == 0) {
 
     private static void removeExistingFiles(Path root, @Nonnull List<? extends IWorldgenDefinition> definitions) {
         for (IWorldgenDefinition definition : definitions) {
-            Path filePath = root.resolve(Paths.get(definition.getDepositName()));
+            Path filePath = root.resolve(Paths.get(FileUtility.slashToNativeSep(definition.getDepositName())));
 
             try {
                 if (Files.exists(filePath)) {
@@ -441,7 +441,7 @@ private static <T extends IWorldgenDefinition> void addAddonFiles(Path root, @No
         while (it.hasNext()) {
             T definition = it.next();
 
-            JsonObject element = FileUtility.tryExtractFromFile(root.resolve(definition.getDepositName()));
+            JsonObject element = FileUtility.tryExtractFromFile(root.resolve(FileUtility.slashToNativeSep(definition.getDepositName())));
 
             if (element == null) {
                 GTLog.logger.error("Addon mod tried to register bad ore definition at {}", definition.getDepositName());