Error during Hotfix installation – "Version string portion was too short or too long"

Recently we had a problem when installing a Hotfix for AX 2009.The installation stopped with an error and we could find the following information in the setup log: === Starting execution phase ===Starting the Microsoft Dynamics AX Client executable: C:\Program Files (x86)\Microsoft Dynamics AX\50\Client\bin\ax32.exe “-regconfig=Ax2009myConfig” “-logdir=C:\Documents and Settings\All Users\Application Data\Microsoft\Dynamics AX\Dynamics AX Setup Logs\2009-10-21 12-37-06”…

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