WordFinder algorithm version.
Values:
| IG_PDF_WF_LATEST_VERSION | 0 | The latest available version. |
| IG_PDF_WF_VERSION_2 | 2 | Version used for Acrobat 3.x, 4.x. |
| IG_PDF_WF_VERSION_3 | 3 | Available in Acrobat 5.0 without Accessibility enabled. Includes some improved word piecing algorithms. |
| IG_PDF_WF_VERSION_4 | 4 | For Acrobat 5.0 with Accessibility enabled. Includes advanced word ordering algorithms in addition to improved word piecing algorithms. |