Hi, doc-view-mode currently calls either ghostscript or mupdf's mudraw to render PDFs to PNG images. Both tools interpret a percentage sign in the name of the target file as a format instruction. Since doc-view's cache directory is named after the input PDF, whose name can contain percentage signs, it, too, can contain percentage signs. As a result, doc-view mode cannot currently handle PDF files whose name contains a percentage sign. I've attached the simplest fix I could think of. Best regards, Elias Pipping