diff --git a/src/officecli/Handlers/ExcelHandler.cs b/src/officecli/Handlers/ExcelHandler.cs
index 3cd25716e..f07cd227d 100644
--- a/src/officecli/Handlers/ExcelHandler.cs
+++ b/src/officecli/Handlers/ExcelHandler.cs
@@ -96,10 +96,17 @@ public ExcelHandler(string filePath, bool editable)
                     .Where(n => !string.IsNullOrEmpty(n)) ?? Enumerable.Empty<string>(),
                 StringComparer.OrdinalIgnoreCase);
         }
-        catch (DocumentFormat.OpenXml.Packaging.OpenXmlPackageException ex)
+        catch
         {
-            throw new InvalidOperationException(
-                $"Cannot open {Path.GetFileName(filePath)}: {ex.Message}", ex);
+            // A failed open must not leak the backing FileStream — the
+            // factory's repair-and-retry paths (FixXmlEncoding /
+            // StripDanglingPackageRels) reopen the file for in-place fixes
+            // and would hit "file is being used by another process".
+            // Matches the cleanup pattern in WordHandler's constructor.
+            _doc?.Dispose();
+            _filteredPackageStream?.Dispose();
+            _backingStream?.Dispose();
+            throw;
         }
     }
 
diff --git a/src/officecli/Handlers/PowerPointHandler.cs b/src/officecli/Handlers/PowerPointHandler.cs
index 857907231..62eec0a0d 100644
--- a/src/officecli/Handlers/PowerPointHandler.cs
+++ b/src/officecli/Handlers/PowerPointHandler.cs
@@ -115,9 +115,23 @@ public PowerPointHandler(string filePath, bool editable)
         var share = editable ? FileShare.Read : FileShare.ReadWrite;
         var access = editable ? FileAccess.ReadWrite : FileAccess.Read;
         _backingStream = new FileStream(filePath, FileMode.Open, access, share);
-        _doc = PresentationDocument.Open(_backingStream, editable);
-        if (editable)
-            InitShapeIdCounter();
+        try
+        {
+            _doc = PresentationDocument.Open(_backingStream, editable);
+            if (editable)
+                InitShapeIdCounter();
+        }
+        catch
+        {
+            // A failed open must not leak the backing FileStream — the
+            // factory's repair-and-retry paths (FixXmlEncoding /
+            // StripDanglingPackageRels) reopen the file for in-place fixes
+            // and would hit "file is being used by another process".
+            // Matches the cleanup pattern in WordHandler's constructor.
+            _doc?.Dispose();
+            _backingStream?.Dispose();
+            throw;
+        }
     }
 
     /// <summary>