Found In

CET 16.5 Patch 1

Summary

Users have reported that when exporting a SIF using a manufacturer-specific export format, the file is incorrectly exported as a text (.txt) file instead of a SIF:

Steps to Reproduce

1. Open a drawing in CET
2. Navigate to Calculation view
3. Go to File > Order export 
4. Attempt to export using a manufacturer-specific export format (note: Configura SIF appears to be unaffected by this bug)
5. Observe that file exports as .txt file instead of .sif

Workaround

You can safely rename the text (.txt) file back to a SIF (.sif) file, and the contents of the SIF will remain unaffected.

This issue is resolved in the latest version of CET