Isolating project from my addons folder

operator_wav_import.py

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+import bpy
+import os
+
+def import_wav_files(filepath, pack, dir, fake):
+    
+    def import_one(fp):
+        sound = bpy.data.sounds.load(fp, check_existing=False)
+        if pack:
+            sound.pack()
+            
+        if fake:
+            sound.use_fake_user = True
+            
+    if dir:
+        the_dir = os.path.dirname(filepath)
+        for child in os.listdir(the_dir):
+            if child.endswith(".wav"):
+                import_one(os.path.join(the_dir, child))
+                
+    else:
+        import_one(filepath)
+        
+    return {'FINISHED'}
+
+
+from bpy_extras.io_utils import ImportHelper
+from bpy.props import StringProperty, BoolProperty, EnumProperty
+from bpy.types import Operator
+
+
+class ImportWav(Operator, ImportHelper):
+    """Import WAV audio files"""
+    bl_idname = "import_test.wav_file_batch" 
+    bl_label = "Import WAV Files"
+
+    filename_ext = ".wav"
+
+    filter_glob: StringProperty(
+        default="*.wav",
+        options={'HIDDEN'},
+        maxlen=255,  # Max internal buffer length, longer would be clamped.
+    )
+    
+    fake: BoolProperty(
+        name="Add Fake User",
+        description="Add the Fake User to each of the sound files",
+        default=True,
+    )
+    
+    all_in_directory: BoolProperty(
+        name="All Files in Folder",
+        description="Import every WAV file found in the folder as the selected file",
+        default=False,
+    )
+
+    def execute(self, _):
+        return import_wav_files(filepath=self.filepath, pack=False, dir=self.all_in_directory, fake=self.fake)
+