Can anyone tell me what type of a file uses an extension of: .pdf.ld

[Guest]

I am reviewing a batch of about 50,000 electronically and it looks like about 1% of the files have a file extension of    .pdf.ld.

I am guessing that these are "lock" files that Acrobat creates during editing or linking processes but I can't find anything confirm that.

My guess is based upon the fact that these files always have a matching file of the same name with the .pdf   extension, and the matching file always has the same exact creation date and time as the   .pdf.ld   file.

[jane-e]

Can you open them? What is the size?

If the file size is zero, you can absolutely delete them.