Great! Nice to see there's the zoom now and scrolling by letting the keys pressed.

Sometimes, it exits of the pdf, why? Is it the error handler that does so?

Anyway, thanks a lot! Though waiting for new features like searching, going to a specific page, using it from a basic function like in mViewer with mv().

Would someone care to explain thoroughly how to install this for my CX? I'm new to this whole concept and i'm completely lost and have been trying for the last few hours! Thanks in advance! 

Well, you should execute it once in the beginning to register the file extensions. Then you can click directly on .pdf files.

@Vogtinator: How can I run elf2flt on the .elf file? I'm running it with just the -o option, and all I get is a bunch of "bad reloc" messages. Maybe it would be better to wait until Zehn is merged into the official Ndless?

This doesn't work at all for me. Am i doing something wrong? Im running ndless 3.6 on a TI Nspire CX CAS w/ OS 3.6. I downloaded the nPDF binary file and dragged nPDF.tns to documents, and ran it. nPDF ran successfully and says that i should be able to open .pdf, .xps, and .cbz files. But when i try to open a pdf file it says file format not supported. The pdf in question im trying this out on is the "TI Nspire cx cas getting started guide". a 1.4mb file. i renamed the pdf extension to tns to get it on the calculator so does that have something to do with it?

Thanks it works fine now. If i could make one feature request it would be to control the brightness. a black on white pdf is a bit overwhelming on the eyes.

Yeah he's using his fork while waiting for the PR to be merged (if/when they do), since it's useful features for the mViewer conversions (cf. news).
But I'm sure the PR will get approved, after all it's all improvements for the comfort of the users.
It's good to see open-source community projects being worked on [by several people, I mean], at least.

I haven't been around much mainly because of school.

Anyway, I fixed another bug yesterday that triggered a crash on exit half the time, introduced by one of critor's bug fixes, which was a workaround for the fact that the Nspire's malloc returns a buffer that is 4-byte aligned, not 8. The screen buffer has to be 8-byte aligned. Now Vogtinator did a similar workaround in the SDK so programs don't have to deal with it. The only drawback is that now malloc allocates an extra 8 bytes for each call. It's not that much, though.