dotnet/wpf · error · COMException

0x80041703

0x80041703

Error message

Filter does not have a working file. This is typically caused by a missing or failed call to IPersistFile::Load.

What it means

COMException from XamlFilter.GetChunk: the filter is asked for the next chunk, but its internal XamlReader is null because IPersistFile::Load was never called or failed, so there is no working XAML content to index. The message identifies the missing Load call as the cause.

Solutions

1. Call IPersistFile::Load on the filter (or IFilter initialization) before requesting chunks
2. Handle the COM error and return FILTER_E_ACCESS to the indexing client instead of propagating

When it happens

Trigger: Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/MS/Internal/IO/Packaging/XamlFilter.cs:219 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/37e19fdd3e1e777e. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/MS/Internal/IO/Packaging/XamlFilter.cs:219

        /// On end of stream, this function will return null.
        /// </remarks>
        public ManagedChunk GetChunk()
        {
            if (!_filterContents)
            {
                // Contents not being filtered, no chunks to return in that case.
                _currentContent = null;

                // End of chunks.
                return null;
            }

            IndexingContentUnit     contentUnit;

            // If client code forgot to load the stream, throw appropriate exception.
            if (_xamlReader == null)
            {
                throw new COMException(SR.FilterGetChunkNoStream, (int)FilterErrorCode.FILTER_E_ACCESS);
            }

            // If at end of chunks, report the condition.
            if (_filterState == FilterState.EndOfStream)
            {
                //Ensure _xamlReader has been closed
                EnsureXmlReaderIsClosed();

                // End of chunks.
                return null;
            }

            try
            {
                contentUnit = NextContentUnit();
            }
            catch (XmlException xmlException)
            {

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