Attaching two files. One was created by M$O link text and other one was converted by LO link text. The first file have readable Cyrillic symbols, but after opening in LO for editing and saving in the same format all Cyrillic symbols converted to unreadable symbols. Editing was made on Linux and Win7 with the same results.
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I created the bug report. Thanks for advice.
→ fdo#50775 - FILESAVE: .rtf saving encoding problem
Current status of fdo#50775 is RESOLVED DUPLICATE of bug 48023
Current status of fdo#48023 is VERIFIED FIXED