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How to get rid of the error ERROR OS: -906, unable to open TAF or DBL or LOG File. ERROR OS=2 DLL RDM330 mean when opening a Concept program?

Goals and Symptoms

When opening a Concept program ( OS Windows XP and Concept ver 2.5), getting an error ERROR OS: -906, unable to open TAF or DBL or LOG File. ERROR OS=2 DLL RDM330. OS:

Facts and Changes

This resolution lists some recommendations to eliminate the error ERROR OS: -906, unable to open TAF or DBL or LOG File. ERROR OS=2 DLL RDM330. OS: Windows XP and Concept Version 2.5

Causes and Fixes

If the error only happens on certain projects, close Concept & delete .Q1 & .Q2 files.
Then use Concept Converter to export and re-import the project .


If this error occurs when launching Concept, delete the Vista.* files, and delete all *.TAF files.
(These file are regenerated when Concept is launched.)
• Launch Concept, make sure install folder is 8 chars. or less.


• Go to the Properties of the concept.exe file - security tab and give all users
full control


• Environment variables – User variable TEMP. Change to what
TEMP System Variables is, usually
C:\TEMP or C:\windows\TEMP.


• Make sure
C:\WINDOWS\TEMP\CONCEPT is not write protected.

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