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char* filterInstallDir
The full path name of the directory from which your filter was loaded (which is presumably the directory in which it was installed). This can be useful for locating files (such as HTML help files) which were installed as separate resources in your filter's installation directory.
Note that at filter design time, filterInstallDir will contain the name of the directory from which FilterMeister itself was loaded, not the directory from which your target filter will ultimately be loaded at run-time.
Info(filterInstallDir);