Deploying program with plugin on different computer

[ChrisW67]

This is the directory structure my deployed application uses:

C:\Program Files\
  MyProgram\
    MyProgram.exe
    mingwm10.dll
    libgcc_s_dw2-1.dll
    QtCore4.dll
    QtGui4.dll
    ...
    sqldrivers\
      qsqlite4.dll
    imageformats\
      ...
    iconengines\
      ...

C:\Program Files\
  MyProgram\
    MyProgram.exe
    mingwm10.dll
    libgcc_s_dw2-1.dll
    QtCore4.dll
    QtGui4.dll
    ...
    sqldrivers\
      qsqlite4.dll
    imageformats\
      ...
    iconengines\
      ...

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So your general layout was OK. Your Mysql plugin has dependencies of its own on one or more Mysql DLLs that must also be present on the target system. Try running Depends.exe against the Mysql plugin.