If this is happening to you please post on MacRumors Forums. The following links are relevant to these articles and more: Why Mac PDF won't delete 'unprotected' files from PDF document (Windows Vista or 8) — MacRumors Forums Why My PDF File has no Preview in Microsoft Preview — MacRumors Forums How to Move, Delete, or Change Files in Microsoft Preview, Part 3 — MacRumors Forums How to Move, Delete, or Change Files in Microsoft Preview, Part 2 — MacRumors How to Move, Delete, or Change Files in Microsoft Preview, Part 1 — MacRumors Forums How to Delete PDF Pages in Microsoft Preview (Windows Vista) — MacRumors Forums The following articles are relevant to these articles and more: Why Preview Won't Delete PDF Files in My Computer — MacintoshWorld Forums How to Delete PDF Files from My Computer — MacRumors Forums Why Preview Won't Delete PDF Files from My Computer — MacRumors Forums I have made a pdf.pdf file, but it won't open with preview in Microsoft Preview. I used to play with the preview feature using Preview on my Windows computer. Now I use Preview on my Mac, and it seems to have lost its function. What can I do? Use the free software to migrate to your Mac, as described in the FAQs on their site, at . The software also allows you to copy files from your Windows PC to your Mac, but I believe this won't work with the PDFs listed here. Why can't I use it to back up my PDF files? The PDF viewer is a PDF writer. It's been designed to copy PDF files to your computer. To edit PDF files or change the file attributes, it needs to know what's stored in the PDF file. It won't do that if there's no PDF file at all. If you are using Apple's Preview to view or edit PDFs, but you want to make sure the PDF reader on your computer isn't deleting PDF pages at random, you can use the following free software to do this.