'application/octet-stream' is not a valid type for PDF files. It must be 'application/pdf' for example. If this happens for all PDF files the something in your system.

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Some scanners mail the scanned pdf file as an application/octet-stream with pdf extension. These are indeed pdf files. Currently, they are not opened as pdf, but I get the application chooser dialog, because no application is associated to application/octet-stream.

I would like the system to (try and) open such files as pdf files, i.e., fall back to filename extension-based detection for application/octet-stream mimetyped files. Is this possible to configure in the file associations kcm or in another way? An octet-stream is random binary data. You can assign it to eg.

Okular, but that's 'wrong' since it's random binary data. What needs to happen is that whatever opens the file (kmail?) either prefers the suffix over the mimetype (ugghhh.) or (much better omits the (particular) mimetype, so that the system is forced to detect it. -> File a bug against whatever opens it. A shorthand 'solution' would likely be to assign octet-stream data to always be openened by 'kioclient[4 5] exec%U' (which redirects the opening and scratches the mimetype), but I've never tried that.

=> 'kcmshell[4 5] filetypes'.

Tools that I'm using for this: Chrome Notepad++ Sublime Text 3 Fiddler WinMerge Adobe Acrobat Reader X Synopsis I have downloaded a pdf twice, once through Chrome as an experimental control; once again through a raw /GET request via Fiddler which returns me an octet-stream. To this point, I can save the octet-stream as pdf and I can get the proper page count and some of the page headers and numbers, but very little of the body content is loading. When I open my file in Adobe Reader X, I get an error that it Cannot extract the embedded font 'LFIDTH+ArialMT'. Some characters may not display or print correctly and I cannot work through why it can be extracted from the 'true' pdf but cannot from the one I am saving. Details As for my manual pull of the file, I have provided Accept: application/pdf, application/x-pdf, application/x-gzpdf, application/x-bzpdf The server sent me back an aplication/octet-stream with an attachment Disposition.

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So to recap: • Valid Foo.pdf sitting on my hard drive • HTTP Response with an octet-stream version of same file, in UTF-8 encoding (I assume) Here is what I know: I pulled the Message Body of the response from the server and dropped it to file. I then ran a WinMerge comparison of it against the contents of the pdf and every line mismatched on line endings. I re-encoded the EOLs for Unix and the diff shrank to ~1k lines out of 160k. A close inspection of the mismatch indicates that the valid pdf maintains what looks like a NUL 00 character in places whereas my octet-stream contains literal spaces. Also, the 'true' pdf is reporting EOL: LF 1252 Mixed through WinMerge. My 'raw' pdf is reporting 1252 Unix When I homogenize the 'true' pdf to 1252 Unix, I get the same issue as I explained in the 'raw' one. Is there anything I can do to get this mess of an octet-stream straightened out?

Note that the pdf that was downloaded through Chrome is historic. I have it on my machine, but I downloaded it 'sometime in the past' and the request headers used when processing that /GET are no longer available. Attempting to download through the browser 'now' results in an error, but an explicit GET request against the resource through Fiddler is returning the pdf as an octet-stream.