I think I have seen this before and apparently, that was caused by a bug. Not sure about it though.
Has this ever worked before?
I have the exact same special character error message, but only in version 10. I can upload the same prompt from the same location to a version 9. Sorry I can't help you, but did you find a solution for the special character error message?
We are currently working on an issue with uploading prompts with the DE team. This seems to be causing different error messages in different environments.
As a workaround, please zip the prompt file and upload the zipped file and let me know how it goes.
Thanks for the update Attila.
Can you please let us know the IE version used for testing? IE 8 and IE 9 are the only supported versions in 10.x.
Did you ever reach a resolution for this hitting the same thing on System version: 10.0.1.11001-37?
Never mind re-read the thread. Firefox works.
We have raised the following defect to address the issues on IE for the prompt upload:
The defect says zipped prompts but the fix for the defect will include both zipped and normal prompts issues with IE.
This is fixed in 10.5.1 onwards.
It also happened to me with IE 9. Zipping the file does not fix the problem and using Google Chrome also does not.
The only solution for me was using Mozilla Firefox, in my case version 31 worked fine.
This is a very annoying bug.