WPS Office (KingSoft Spreadsheets, ET.exe) does not fully support the COM add-in loading mechanism Excel-DNA uses for ribbons and CTPs, causing a misleading error dialog on every load — even though worksheet functions work fine.

Changes

• ExcelComAddInHelper.cs — Added IsRunningUnderWps() helper that detects the host process is ET.EXE (wrapped in try-catch for restricted environments), and added an else if branch in the catch (Exception ex) handler of LoadComAddIn to downgrade the log level from Error to Info when running under WPS.

This follows the exact same pattern already used for the Excel /K command-line switch:

if (Environment.CommandLine.Contains(" /K"))
{
    Logger.ComAddIn.Info("Load Ribbon/COM Add-In exception with /K in CommandLine \r\n{0}", ex.ToString());
}
else if (IsRunningUnderWps())
{
    Logger.ComAddIn.Info("Load Ribbon/COM Add-In exception under WPS Office \r\n{0}", ex.ToString());
}
else
{
    Logger.ComAddIn.Error(ex, "The Ribbon/COM add-in helper required by add-in {0} could not be registered...", ...);
}

The failure is still logged at Info level, so diagnostics are preserved without surfacing a confusing error dialog to end users.