Import Not Finding All Files in Folder Tree (which files were missed?)

Question

I'm a new LR4.1 user running on a 15" Macbook Pro (OS X 10.7.4).
I exported my Aperture Library masters: mostly NEF files from Nikon D100, D200, D300, D800 cameras, and also JPG, TIF, and PSD files, etc.
Aperture reported this export count: 
51285 of 50582 (don't ask me why it exported more than it thought it had!).
After export, I used "find" (case-insensitive) in the output directory tree to count all NEF, TIF[F], PSD, PNG, JPG, GIF, AVI, and MOV files spit out by Aperture: I found 51277 such files (pretty close to the Aperture export count, although not exactly the same).
However when I point Lightroom to that folder tree with the exported Aperture masters, an IMPORT operation only reports 44279 photos for import (at lower left of expanded import dialog). About 7,000 less than Aperture exported! I have "Include Subfolders" checked and "Don't Import Suspected Duplicates" unchecked in the LR import dialog. Also, I am using the "ADD" option in the import dialog.
How can I figure out which files Lightroom is missing? (I haven't actually imported anything yet due to the discrepancy.)
I can't see how the discrepancy could be so large. I think LR should support most of my Aperture-supported files.
I see LR doesn't support 32 bit files, but I don't see how I could have 7K files (maybe some, but I don't think 7k!) (I will check this later, am installing Xcode and ImageMagick to check the count of 32 bit deep files).
If anyone can offer ideas on how I can find the missed files, it would be appreciated.
(Maybe if I proceed with the import and there is some way to export a text file listing of library files, then I could process that file vs. the actual files in the directory tree to deduce the problem issues.)
Regards,
Colin

Answer 1

randomenemy wrote:
Also, interesting you say 32 bit files are supported:
on the following Adobe page, it says they are not supported:
http://help.adobe.com/en_US/lightroom/using/WS42D207D7-B290-4baa-A896- AB71965BF24B.html
-Colin
LR4.1 Update Readme 'Supported File Formats:
Supported File Formats:
• JPEG
• TIFF (8 bit, 16 bit, 32 bit)
• PSD (8 bit, 16 bit)
• DNG
• Raw (Please visit  for a full list of raw file support) /products/photoshop/cameraraw.html
• Common DSLR video formats, including MOV, MPG, AVI, and AVCHD
Important File Format Support Exceptions (Formats not supported):
• PSD files saved without a composite image. (Saved without “Maximize Compatibility” setting)
• Files with dimensions greater than 65,000 pixels per side (512 Megapixel Total)
• AVCHD support is limited to MTS and M2TS video files.