Bug#799302: Acknowledgement (xchm: ../src/common/unichar.cpp(65): assert "Assert failure" failed in ToHi8bit(): character cannot be converted to single byte)

[Oleksandr Gavenko]

Downgrading to xchm_1.20-1_amd64.deb from
https://packages.debian.org/wheezy/amd64/xchm/download resolve my issue.

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Best regards!