diff --git a/CHANGELOG.md b/CHANGELOG.md
index b51f79499..cfb71b8ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@
     Bug #4491: Training cap based off Base Skill instead of Modified Skill
     Bug #4495: Crossbow animations blending is buggy
     Bug #4496: SpellTurnLeft and SpellTurnRight animation groups are unused
+    Bug #4497: File names starting with x or X are not classified as animation
     Bug #3249: Fixed revert function not updating views properly
     Feature #2606: Editor: Implemented (optional) case sensitive global search
     Feature #3276: Editor: Search- Show number of (remaining) search results and indicate a search without any results
diff --git a/components/nifbullet/bulletnifloader.cpp b/components/nifbullet/bulletnifloader.cpp
index 8f827e4e2..be5a7d9d6 100644
--- a/components/nifbullet/bulletnifloader.cpp
+++ b/components/nifbullet/bulletnifloader.cpp
@@ -34,6 +34,13 @@ btVector3 getbtVector(const osg::Vec3f &v)
     return btVector3(v.x(), v.y(), v.z());
 }
 
+bool pathFileNameStartsWithX(const std::string& path)
+{
+    const std::size_t slashpos = path.find_last_of("/\\");
+    const std::size_t letterPos = slashpos == std::string::npos ? 0 : slashpos + 1;
+    return letterPos < path.size() && (path[letterPos] == 'x' || path[letterPos] == 'X');
+}
+
 }
 
 namespace NifBullet
@@ -88,18 +95,10 @@ osg::ref_ptr<Resource::BulletShape> BulletNifLoader::load(const Nif::NIFFilePtr&
     else
     {
         bool autogenerated = hasAutoGeneratedCollision(node);
-        bool isAnimated = false;
 
         // files with the name convention xmodel.nif usually have keyframes stored in a separate file xmodel.kf (see Animation::addAnimSource).
         // assume all nodes in the file will be animated
-        std::string filename = nif->getFilename();
-        size_t slashpos = filename.find_last_of("/\\");
-        if (slashpos == std::string::npos)
-            slashpos = 0;
-        if (slashpos+1 < filename.size() && (filename[slashpos+1] == 'x' || filename[slashpos+1] == 'X'))
-        {
-            isAnimated = true;
-        }
+        const bool isAnimated = pathFileNameStartsWithX(nif->getFilename());
 
         handleNode(node, 0, autogenerated, isAnimated, autogenerated);