fix: correctly resolve file if extension is given (#2857)

* fix: correctly resolve file if extension is given

* Adjust error if ClipboardFormats#findByFile null

worldedit-core/src/main/java/com/fastasyncworldedit/core/util/MainUtil.java

@@ -712,6 +712,12 @@ public class MainUtil {
                 return file;
             }
         }
+        if (filename.matches(".*\\.[\\w].*")) {
+            File file = MainUtil.resolveRelative(new File(dir, filename));
+            if (file.exists()) {
+                return file;
+            }
+        }
         for (ClipboardFormat f : ClipboardFormats.getAll()) {
             File file = MainUtil.resolveRelative(new File(dir, filename + "." + f.getPrimaryFileExtension()));
             if (file.exists()) {

worldedit-core/src/main/java/com/sk89q/worldedit/command/SchematicCommands.java

@@ -401,7 +401,11 @@ public class SchematicCommands {
                 if (format == null) {
                     format = ClipboardFormats.findByFile(file);
                     if (format == null) {
+                        if (noExplicitFormat) {
+                            actor.print(Caption.of("fawe.worldedit.schematic.schematic.load-failure", TextComponent.of(file.getName())));
+                        } else {
                             actor.print(Caption.of("worldedit.schematic.unknown-format", TextComponent.of(formatName)));
+                        }
                         return;
                     }
                 }

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/ClipboardFormats.java

@@ -208,7 +208,6 @@ public class ClipboardFormats {
             }
         }
         return null;
-
     }
 
     public static MultiClipboardHolder loadAllFromInput(