PostScript multipage issue

I’m using Raster Imaging C++ Class Library (LT 16.5) to convert miltipage PS (v 3.0) to other raster format (for example to TIFF). When I call LFile::GetInfo(), it updates FILEINFO structure, but TotalPages member is always equal to 1. Even for multipage input file.
I tried to pass desired page number to LBitmapBase::Load(), but it just loads the first page and ignores nPage argument.
The same code works fine for PDF files.
What should I do to load whole the pages of multipage PS?
I attached simple code example that demonstrates the issue. The test files I used are placed at TestFiles subfolder.

Thank you,

LEADTOOLS loads PS files similar to Adobe PhotoShop. PhotoShop only opens the first page, so does LEADTOOLS.

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