Equisys technical notes

Technical guidance, explanations and fixes for our products

PRB: 'Invalid or unknown format for print spool file ZETAFAX.SPL' error when addressing fax



ID: ZTN1277

This Zetafax technical note applies to:

  • Zetafax client version
  • Windows 98


Zetafax users on Windows 98 systems receive the following error message after printing a document within an office application e.g. Microsoft Excel.


This error is caused by incorrect parameters being passed to the Zetafax printer when it is selected within the application for printing. This results in a ZETFAX.SPL file with an incorrect resolution. This will only occur when the Zetafax printer is not the default printer.


If the Zetafax printer is the default printer within Windows the error will not occur. To set the Zetafax printer as default printer browse to the printers' folder right-click the Zetafax printer and select 'Set as Default Printer'.

For Administrators who do not wish to change the default printer on their client systems Equisys has provided an update which resolves this issue. This update can be downloaded from the Equisys website using the following link:



This has been identified by Equisys as a problem with the software versions given above.

Last updated:   3rd July 2003 (SV/GC)

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