diff --git a/src/api/java/baritone/api/schematic/ISchematicSystem.java b/src/api/java/baritone/api/schematic/ISchematicSystem.java
index c8f039070..385cc0514 100644
--- a/src/api/java/baritone/api/schematic/ISchematicSystem.java
+++ b/src/api/java/baritone/api/schematic/ISchematicSystem.java
@@ -21,6 +21,7 @@ import baritone.api.command.registry.Registry;
 import baritone.api.schematic.format.ISchematicFormat;
 
 import java.io.File;
+import java.util.List;
 import java.util.Optional;
 
 /**
@@ -41,4 +42,9 @@ public interface ISchematicSystem {
      * @return The corresponding format for the file, {@link Optional#empty()} if no candidates were found.
      */
     Optional<ISchematicFormat> getByFile(File file);
+
+    /**
+     * @return A list of file extensions used by supported formats
+     */
+    List<String> getFileExtensions();
 }
diff --git a/src/api/java/baritone/api/schematic/format/ISchematicFormat.java b/src/api/java/baritone/api/schematic/format/ISchematicFormat.java
index 3fe045bcf..0ccf059b0 100644
--- a/src/api/java/baritone/api/schematic/format/ISchematicFormat.java
+++ b/src/api/java/baritone/api/schematic/format/ISchematicFormat.java
@@ -23,6 +23,7 @@ import baritone.api.schematic.IStaticSchematic;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.List;
 
 /**
  * The base of a {@link ISchematic} file format
@@ -42,4 +43,9 @@ public interface ISchematicFormat {
      * @return Whether or not the specified file matches this schematic format
      */
     boolean isFileType(File file);
+
+    /**
+     * @return A list of file extensions used by this format
+     */
+    List<String> getFileExtensions();
 }
diff --git a/src/main/java/baritone/command/defaults/BuildCommand.java b/src/main/java/baritone/command/defaults/BuildCommand.java
index bb34254ae..f9ddd33ef 100644
--- a/src/main/java/baritone/command/defaults/BuildCommand.java
+++ b/src/main/java/baritone/command/defaults/BuildCommand.java
@@ -26,11 +26,13 @@ import baritone.api.command.datatypes.RelativeFile;
 import baritone.api.command.exception.CommandException;
 import baritone.api.command.exception.CommandInvalidStateException;
 import baritone.api.utils.BetterBlockPos;
+import baritone.utils.schematic.SchematicSystem;
 import org.apache.commons.io.FilenameUtils;
 
 import java.io.File;
 import java.util.Arrays;
 import java.util.List;
+import java.util.StringJoiner;
 import java.util.stream.Stream;
 
 public class BuildCommand extends Command {
@@ -44,10 +46,29 @@ public class BuildCommand extends Command {
 
     @Override
     public void execute(String label, IArgConsumer args) throws CommandException {
-        File file = args.getDatatypePost(RelativeFile.INSTANCE, schematicsDir).getAbsoluteFile();
+        final File file0 = args.getDatatypePost(RelativeFile.INSTANCE, schematicsDir).getAbsoluteFile();
+        File file = file0;
         if (FilenameUtils.getExtension(file.getAbsolutePath()).isEmpty()) {
             file = new File(file.getAbsolutePath() + "." + Baritone.settings().schematicFallbackExtension.value);
         }
+        if (!file.exists()) {
+            if (file0.exists()) {
+                throw new CommandInvalidStateException(String.format(
+                        "Cannot load %s because I do not know which schematic format"
+                                + " that is. Please rename the file to include the correct"
+                                + " file extension.",
+                        file));
+            }
+            throw new CommandInvalidStateException("Cannot find " + file);
+        }
+        if (!SchematicSystem.INSTANCE.getByFile(file).isPresent()) {
+            StringJoiner formats = new StringJoiner(", ");
+            SchematicSystem.INSTANCE.getFileExtensions().forEach(formats::add);
+            throw new CommandInvalidStateException(String.format(
+                    "Unsupported schematic format. Reckognized file extensions are: %s",
+                    formats
+            ));
+        }
         BetterBlockPos origin = ctx.playerFeet();
         BetterBlockPos buildOrigin;
         if (args.hasAny()) {
@@ -59,7 +80,7 @@ public class BuildCommand extends Command {
         }
         boolean success = baritone.getBuilderProcess().build(file.getName(), file, buildOrigin);
         if (!success) {
-            throw new CommandInvalidStateException("Couldn't load the schematic. Make sure to use the FULL file name, including the extension (e.g. blah.schematic).");
+            throw new CommandInvalidStateException("Couldn't load the schematic. Either your schematic is corrupt or this is a bug.");
         }
         logDirect(String.format("Successfully loaded schematic for building\nOrigin: %s", buildOrigin));
     }
diff --git a/src/main/java/baritone/utils/schematic/SchematicSystem.java b/src/main/java/baritone/utils/schematic/SchematicSystem.java
index 8afafa8c3..ec6e7f626 100644
--- a/src/main/java/baritone/utils/schematic/SchematicSystem.java
+++ b/src/main/java/baritone/utils/schematic/SchematicSystem.java
@@ -24,6 +24,7 @@ import baritone.utils.schematic.format.DefaultSchematicFormats;
 
 import java.io.File;
 import java.util.Arrays;
+import java.util.List;
 import java.util.Optional;
 
 /**
@@ -48,4 +49,9 @@ public enum SchematicSystem implements ISchematicSystem {
     public Optional<ISchematicFormat> getByFile(File file) {
         return this.registry.stream().filter(format -> format.isFileType(file)).findFirst();
     }
+
+    @Override
+    public List<String> getFileExtensions() {
+        return this.registry.stream().map(ISchematicFormat::getFileExtensions).flatMap(List::stream).toList();
+    }
 }
diff --git a/src/main/java/baritone/utils/schematic/format/DefaultSchematicFormats.java b/src/main/java/baritone/utils/schematic/format/DefaultSchematicFormats.java
index 40a95b50c..25ef7b0d9 100644
--- a/src/main/java/baritone/utils/schematic/format/DefaultSchematicFormats.java
+++ b/src/main/java/baritone/utils/schematic/format/DefaultSchematicFormats.java
@@ -22,13 +22,15 @@ import baritone.api.schematic.format.ISchematicFormat;
 import baritone.utils.schematic.format.defaults.LitematicaSchematic;
 import baritone.utils.schematic.format.defaults.MCEditSchematic;
 import baritone.utils.schematic.format.defaults.SpongeSchematic;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtIo;
 import org.apache.commons.io.FilenameUtils;
 
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
-import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.NbtIo;
+import java.util.Collections;
+import java.util.List;
 
 /**
  * Default implementations of {@link ISchematicFormat}
@@ -98,4 +100,9 @@ public enum DefaultSchematicFormats implements ISchematicFormat {
     public boolean isFileType(File file) {
         return this.extension.equalsIgnoreCase(FilenameUtils.getExtension(file.getAbsolutePath()));
     }
+
+    @Override
+    public List<String> getFileExtensions() {
+        return Collections.singletonList(this.extension);
+    }
 }