You can try removing "thousands separator" as commas are used to separate values not digits in .csv format.
There should be something like field separator as well which should be set to a comma.
I recommend downloading Libre Office or using Google Docs. Those programs handle standard .csv files without problems.
Why Excel can't open .csv (which stands for comma separated values) in their default format and keeps assuming there should be a tab or some other separator between values even though it's in the very name of the format that commas are used to separate values I honestly do not comprehend. If you have some time you could try emailing their support and making a rant about it.
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Hey, what does solver connecting do or connecting to recently used solver?
Our architecture is: a separate solver (engine which does calculations) and graphical interface (PioViewer). You first need to connect the engine to the GUI. As of right now we have separate preflop solver/viewer and that's why it needs to connect to it when opening preflop saves. This will be dealt with in the next release.
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but don't quite understand AMD quad core vs something like dual core i7/i5.
As a general rule: anything AMD which is older than Ryzen is very slow and it's not recommended to run the solver on those CPUs.
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but thought more cores would be better in this circumstance for calcing stuff in something like piosolver.
It's number of physical cores * frequency they run on (base one, not turbo) but only if the CPUs are from similar generation/similarly good. As a general rule that means all Intel CPUs from around Sandy Bridge/Ivy Bridge generation and modern AMD CPUs (Ryzen and Thread Ripper). While older Intel cores are a bit slower than the newest one the difference isn't that big. With old AMD cores it's very big though.