7zFM 4.09 beta can't create archive if >1 file is selected
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If more than 1 file is selected from within 7-Zip File
Manager panel, then choose add button to create an
archive, 7-Zip will deselect all files from the panel,
then exits with 'unknown error' message when OK is
pressed in the Create Archive dialogue. This did not
happen on 7-Zip 3.13.