I downloaded a spreadsheet that has Cyrillic in it, and LibreOffice display is as gibberish.
I have Cyrillic enabled; I can open a new spreadsheet and type Cyrillic and it displays just fine. I tried changing the font, but that didn't produce readable text.
I opened the spreadsheet in a text editor (it's just XML) and the encoding is UTF-8 and I can actually read the Cyrillic text.
Update:
I played with the file a bit. No matter what format I save it in, I still get gibberish. I think I might've looked at something else when I thought I can open it as a text. I think that was individual invoices I downloaded. They came down as pdfs but for each item I also got an xslt / xml pair of files.
Here is a copy of the file with the data stripped. I put "Test" in cell A1 to show that Cyrillic works on my system:
Any ideas?