yep...XP user here, first time in weeks Paragon Chat won't launch even after revalidating pigg files. CoH is indeed installed in Folder, not sure why says complete installation required.
It's saying that because starting with 0.98b I'm compiling the release build with Visual Studio 2015. Upgrading to that version resulted in significant improvements to the optimizations for both code size and speed.
IN THEORY, I'm using the target settings to create Windows XP compatible builds. However, apparently Microsoft broke the _stat() function in the C runtime library sometime between 2008 and 2015, and it always returns failure on XP (but not on Windows 7). Since Paragon Chat uses that to test for the existence of directories and files, it completely lost the ability to know that it's installed correctly on XP.
Of course this was
really annoying to debug, as VS2015 won't run on XP, and neither will its remote debugger target. I also can't use the VS2008/2010 remote debuggers because in the same version that they removed XP compatibility, they also changed the protocol making it unable to talk to old versions...
Thanks Microsoft </sarcasm>
Anyway, it should be fixed in 0.98c. That might fix Macs as well if the same thing is affecting them, but I have no idea what level of OS Wine emulates.