Bad custom cell format.
KB-20200316-01
Version
Before XFRX 19.2.0
Cause
Character " (Double quotes) and (Space) in cell format. Output is XLS or XLSPLAIN.
Symptoms
Cell value contains character \ (Backslash).
Workaround
Use output NATIVE_FXLSX, NATIVE_PFXLSX, FODS or PFODS.