Is the design file format different in PI Expert version 6.1?
Yes, PI Expert version 6.1 uses the *.UDS file format. The *UDX and *.UDF formats were used with previous versions, prior to 5.0 and6.1, and must be converted to work with PI Expert version 6.1. This conversion may slightly modify the original *.UDX, *.UDF file results. The PI Viewer is available to review the original content of *.UDX, *.UDF files.