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fender, thanks but as i say - i dont want to have to open them at all, i want to see what the PDF is by the thumbnail image.
i can open them all, and the ones that are corrupted just open with a corrupted icon, so i have to remember the weird jibberish name its been given, then close it so i can delete it, and the ones that arent corrupted, i have to also memorise the weird jibberish name its been given, close it, then find it in the list again, and rename it - then when i rename it, it jumps to where it belongs in alphabetical order so i have to scroll again to find the ones i was renaming - and it just makes it take longer than it needs to be and is annoying.
there are thousands of documents i need to wade through, so seeing the thumbnails means i dont have to open anything - i can see which are corrupt and which are fine and can rename, just by right clicking and clicking 'rename' from windows explorer