On my Android tablet, it is not possible to open a PDF where "PDF" is written in capital Letters. If I rename the file, it is opened with Google PDF viewer. The error is: "File can't be opened".

How can I fix this issue?

  • So just for clarification: Let's say you have a file called example.PDF that won't open. Are you saying that it works fine if you rename it to example.pdf?
    – dotVezz
    Commented Jun 7, 2016 at 17:21
  • Yes, you are right.
    – etalon11
    Commented Jun 7, 2016 at 18:48
  • Can anyone reproduce this error?
    – etalon11
    Commented Jun 9, 2016 at 8:30
  • Could you perhaps add more information to your question? Which device are you using, which version of Android? Is the file on your SD Card (or /sdcard/ partition) or is it somewhere else?
    – dotVezz
    Commented Jun 9, 2016 at 12:11
  • I have the same problem. Using a Galaxy S5 running 6.0.1 thru Sprint, I have a few different PDF viewers installed. The system tries to open it with the MEMO app. Doesn't give you any other options. When you select MEMO it cannot open the file. Tried looking through the default apps and the App Manager and cannot find neither my PDF viewers or the MEMO app listed to change defaults or reset them.
    – user174029
    Commented Jun 30, 2016 at 19:03

1 Answer 1


As usual, you can't fix the misbehavior exhibited by any app. This is unlike Windows, where you could edit the registry to resolve such issues. With Android, Google effectively owns your phone, and they take extensive measures to prevent you from making modifications or fixes.

Your only option is to install a new PDF handler such as Acrobat Reader or the Drive PDF viewer (invariably bundled with Google Drive).

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