[Bug 57888] Incorrect decimal fixed-point multiplication

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57888

--- Comment #5 from Alexander  ---
This is produced with manually installed .NET 4.8 (and other 4.x version)

To multiple decimals, .NET Framework calls platfirm-specific internal unmanaged
function:

[SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern void FCallMultiply(ref Decimal d1, ref Decimal d2);

IMHO, this bug is a result of incorrect processing of overflowing the
fractional part of the number with a fixed point after multiplication