[Accessibility][Unicode] Tamil file names corrupted when downloading in Unigram (Windows)

[vinbenray]

I am a Windows 10 user with screen reader accessibility. When I download files that have Tamil names from Unigram, the file name gets modified or corrupted after download.
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Example: A file named தமிழ்.docx changes தமிழ.doc / அ_மு_பரம_சிவானந்தம் as அ_ம_பரம_சவனநதம to in the Downloads folder.
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This issue is specific to Unigram – the same file name is preserved correctly in the official Telegram Desktop app.
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My system already supports Unicode, and I use English as display language.
Steps to reproduce:
1.
Send a file with a Tamil name (e.g., தமிழ்.txt) to Unigram.
2.
Download the file on Windows 10.
3.
Check the file name in Downloads folder.
Expected behavior:
The file name should remain exactly as sent (Tamil text intact).
Actual behavior:
The Tamil characters in the file name are changed/modified.
Environment:
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Windows 10 (with screen reader)
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Unigram (latest from Microsoft Store)
This issue affects accessibility for visually impaired users who rely on correct file names.