Was the .qbx file in question saved using the same version of Toad or an earlier version? If so, which version?
Does this happen for every file/model or just a specific one? If so, can you try to isolate the problem?
Can you give us an idea of what was involved in this model, or the query that was generated? Creating a very simple model, saving, and re-opening is working fine.
From: zajac email@example.com
Sent: Tuesday, July 17, 2018 12:11 PM
Subject: [Toad for Oracle - Discussion Forum] Cannot open the selected Model. The file “C:\Path_Name\File_Name.qbx” has unknown content.
Cannot open the selected Model. The file “C:\Path_Name\File_Name.qbx” has unknown content.
Thread created by zajac
How do I solve the error “Cannot open the selected Model. The file “C:\Path_Name\File_Name.qbx” has unknown content.” Some one asked this same question in this
post but did not get a response or answer. I have been unable to successfuly reopen a a model since I started using Toad for Oracle several months ago.
Oracle DBA Edition 2018 v188.8.131.52
Win 10 Pro v1703 build 15063.1088
Oracle Database 12c Standard Edition Release 184.108.40.206.0 - 64bit Production
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Toad for Oracle - Discussion Forum
this post as spam/abuse.