[abenedik]

As you have correctly sad, the current version of ReaderWmf creates a temporary file when metafile is read from a stream.

I am preparing a release of a new version of ReaderWmf. I have already implemented reading metafiles directly from memory stream (without temp file). At first I was not aware that this is possible without a temp file, but after some additional investigation I have found a way to do it.

I think that the new version will be available in the next week.

Until than you can use the mentioned workaround.