Thank you for providing more detailed information about the problem that you've experiencing.
Indeed, I was able to reproduce it either by setting foreign characters in name of the report. Searching further why this happens, it seems that this does not relates to Telerik Reporting itself, but to the Edge browser that doesn't properly encode foreign characters in name of downloaded file. This issue is reported and fixed in Edge 15063 version.
For more information, please refer to the following articles on the topic:
- Content-Disposition header filename encoding
- Microsoft egde doesn't properly encode foreign characters in name of downloaded file
- Win10 Creators Update screwed Word encoding(?) or compatibility with Edge
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