fixlp
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Lazarus 2.2.0 has changed default format of .lpi / .lps / .lpk files. XML structure was changed. The detailed description. So files in new format cannot be opened from Lazarus older than 2.2.0.
Users of old Lazarus versions can convert the file format by means of the fixlp utility. Source code (in Pascal) of this utility: SourceForge page.