I tested the import and export of documents containing umlauts in all formats and was not able to reproduce the issue.
Could you provide some more details, such as:
1. The format of the document you are importing - e.g. RTF, docx, etc;
2. The exact version of the controls you are using - e.g. 2011.3.1116 for Q3, 2011.2.920 for Q2 SP1;
3. The way you are importing the document, if not through the OpenDocumentCommand, which uses the OpenFileDialog.
We would also appreciate it if you could open a support ticket and attach a sample document that reproduces the issue.
the Telerik team
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