doc-view--buffer-file-namedoc-view--buffer-file-name is a variable defined in `
doc-view.el'. Its value is
nilDocumentation: Only used internally. The file name used for conversion. Normally it's the same as `buffer-file-name', but for remote files, compressed files and files inside an archive it is a temporary copy of the (uncompressed, extracted) file residing in `doc-view-cache-directory'.