LoadFromFile fails after doing a MergeFileListFast

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   I am using QuickPDFLibray 0726 in C# to generate a PDF file from 7500 PDF files that will result in a 350Mb to 500Mb PDF file.  This is the extreme case that I need to support and I am having problems at the end when I am trying to load the 350Mb to 500Mb PDF file.
The code goes something like this:

for ( int i = 0; i <= 7500; i++ )
{
     oPDF.AddToFileList("BigFile", @"D:\Temp\" + i.ToString() + ".pdf");
}

oPDF.MergeFileListFast("BigFile", @"D\Output\BigFile.pdf");
oPDF.ClearFileList("BigFile");

if ( oPDF.LoadFromFile(@"D\Output\BigFile.pdf") == 0 )
{
     throw new Exception
}

/* Perform logic to generate outlines/bookmarks for all the included pdf files. */

Unfortunately I keep on getting a 0 result when I load large files.  I started noticing them at 300Mb.  I haven't worked backwards in file size to see if there is a lower limit.  All I know is that the code works fine when then output file is not this large.

I tried loading the file using the DA functions.  They opened the large files without generating an error.  But DAs don't have the capability to manipulate the PDF outlines/ bookmarks, which is what I need.

I noticed that if I loaded a large file only, it would load fine.  However, performing all that logic together is what is causing the large files to not load properly.

Any ideas on what could be causing my large files to not load properly?

Thanks.