Directory.GetFiles returns unexpected results with SearchPattern

Question

I\'m working on a batch program that process a big amount of files (more than 50 000 files) and I\'m facing weird behavior with the Directory.GetFiles method.

Answer 1

As explained by @luaan and by @hans-passant (thanks a lot !) I do not found the file with the .pdfa extension, because the 8.3 format is disabled on my hard drive.

On a hard drive with the 8.3 format enabled, the method behaves like stated in the doc.

The GetFiles has a different behavior with the setting enabled or not.