I have mysql and CR 8.5 (full installation) on my PC and all is well.
My colleague hasn't got CR 8.5 (running off runtime dlls) but has got mysql loaded.
When he runs reports it comes up with the message
Error 599 Cannot open SQL Server. Execute <PEStartPrintJob>
We have copied across everything we can think of + a bit more.
All the p2*.dlls, which includes p2sodbc.dll, p2smon.dll
We have loaded crpe32.dll and crpeaig80.dll, and can run paradox cr8.5 reports no problem.
It is the extra dlls for mysql we haven't figured out.
The runtime.hlp doesn't give any clues for mysql.