diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2162,6 +2162,7 @@
     'PhabricatorBoolEditField' => 'applications/transactions/editfield/PhabricatorBoolEditField.php',
     'PhabricatorBritishEnglishTranslation' => 'infrastructure/internationalization/translation/PhabricatorBritishEnglishTranslation.php',
     'PhabricatorBuiltinDraftEngine' => 'applications/transactions/draft/PhabricatorBuiltinDraftEngine.php',
+    'PhabricatorBuiltinFileCachePurger' => 'applications/cache/purger/PhabricatorBuiltinFileCachePurger.php',
     'PhabricatorBuiltinPatchList' => 'infrastructure/storage/patch/PhabricatorBuiltinPatchList.php',
     'PhabricatorBulkContentSource' => 'infrastructure/daemon/contentsource/PhabricatorBulkContentSource.php',
     'PhabricatorCacheDAO' => 'applications/cache/storage/PhabricatorCacheDAO.php',
@@ -7362,6 +7363,7 @@
     'PhabricatorBoolEditField' => 'PhabricatorEditField',
     'PhabricatorBritishEnglishTranslation' => 'PhutilTranslation',
     'PhabricatorBuiltinDraftEngine' => 'PhabricatorDraftEngine',
+    'PhabricatorBuiltinFileCachePurger' => 'PhabricatorCachePurger',
     'PhabricatorBuiltinPatchList' => 'PhabricatorSQLPatchList',
     'PhabricatorBulkContentSource' => 'PhabricatorContentSource',
     'PhabricatorCacheDAO' => 'PhabricatorLiskDAO',
diff --git a/src/applications/cache/management/PhabricatorCacheManagementPurgeWorkflow.php b/src/applications/cache/management/PhabricatorCacheManagementPurgeWorkflow.php
--- a/src/applications/cache/management/PhabricatorCacheManagementPurgeWorkflow.php
+++ b/src/applications/cache/management/PhabricatorCacheManagementPurgeWorkflow.php
@@ -64,7 +64,11 @@
       }
     }
 
+    $viewer = $this->getViewer();
+
     foreach ($purgers as $key => $purger) {
+      $purger->setViewer($viewer);
+
       echo tsprintf(
         "%s\n",
         pht(
diff --git a/src/applications/cache/purger/PhabricatorBuiltinFileCachePurger.php b/src/applications/cache/purger/PhabricatorBuiltinFileCachePurger.php
new file mode 100644
--- /dev/null
+++ b/src/applications/cache/purger/PhabricatorBuiltinFileCachePurger.php
@@ -0,0 +1,22 @@
+<?php
+
+final class PhabricatorBuiltinFileCachePurger
+  extends PhabricatorCachePurger {
+
+  const PURGERKEY = 'builtin-file';
+
+  public function purgeCache() {
+    $viewer = $this->getViewer();
+
+    $files = id(new PhabricatorFileQuery())
+      ->setViewer($viewer)
+      ->withIsBuiltin(true)
+      ->execute();
+
+    $engine = new PhabricatorDestructionEngine();
+    foreach ($files as $file) {
+      $engine->destroyObject($file);
+    }
+  }
+
+}
diff --git a/src/applications/files/query/PhabricatorFileQuery.php b/src/applications/files/query/PhabricatorFileQuery.php
--- a/src/applications/files/query/PhabricatorFileQuery.php
+++ b/src/applications/files/query/PhabricatorFileQuery.php
@@ -18,6 +18,7 @@
   private $isDeleted;
   private $needTransforms;
   private $builtinKeys;
+  private $isBuiltin;
 
   public function withIDs(array $ids) {
     $this->ids = $ids;
@@ -54,6 +55,11 @@
     return $this;
   }
 
+  public function withIsBuiltin($is_builtin) {
+    $this->isBuiltin = $is_builtin;
+    return $this;
+  }
+
   /**
    * Select files which are transformations of some other file. For example,
    * you can use this query to find previously generated thumbnails of an image
@@ -416,6 +422,18 @@
         $this->builtinKeys);
     }
 
+    if ($this->isBuiltin !== null) {
+      if ($this->isBuiltin) {
+        $where[] = qsprintf(
+          $conn,
+          'builtinKey IS NOT NULL');
+      } else {
+        $where[] = qsprintf(
+          $conn,
+          'builtinKey IS NULL');
+      }
+    }
+
     return $where;
   }