Alternative KiTTY portable

Could you tell more about what kind of files OneDrive doesn't sync?

Thank You.

I'll have a look at that, when I find some time. Maybe you could leave Cyd (the dev of the base app) a note for the special charakters. Perhaps he could avoid them being created somehow.
I prefer a specific data directory over moving registry keys around as its much more robust.

For clarification, OneDrive works fine with percent symbols in characters except for one specific circumstance. If you're using OneDrive for Business on SharePoint Server 2013, you have a big list of characters that it considers "invalid":

~ " # % & * : < > ? / \ { | }.

If running OneDrive for Business on Office 365, SharePoint Online, and SharePoint Server 2016, the list of "invalid" characters is somewhat more reasonable and basically overlaps with what Windows considers invalid in filenames:

" * : < > ? / \ |

Source: https://support.office.com/en-us/article/Invalid-characters-in-file-or-f...

If this was a widespread issue with OneDrive itself, I was going to suggest we come up with a universal solution for all apps, but as this is rather niche, I don't think this will be necessary. I may check if it's possible for the platform to determine if it's running on a OneDrive instance connected to SharePoint 2013 to warn the user since that large set of invalid characters will break quite a few apps.