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Desktop Client: "Unexpected file format" opening an IGX file containing an IDEF0 model

Problem​

When I open an IGX file containing an IDEF0 model I get an error message saying that the file contains an "Unexpected file format." and the file does not open.

Solution​

The ability to view IDEF0 models requires that the IDEF0 diagram type is installed.  While the IDEF0 diagram type is installed by default if an IDEF0 license key is used - it is not installed by default for the FlowCharter, Process or Process for Six Sigma licenses.

  1. Re-run the original iGrafx Desktop Client setup.exe
  2. Select 'Modify' and click 'Next >'
  3. Click 'Next >' to move past the License key page
  4. In the Features tree, under 'Installation', 'Optional Diagrams', select 'IDEF0' and choose 'Will be installed on local hard drive.'
  5. Click 'Next >' to move past the Disk Cost
  6. Click 'Next >' to move past the modification page
  7. Click 'Finish'