I have some DxD schematic files, *.1, *.2, etc, that doesn't have a project file associated with them. I'm wondering how I can open them in DxD?
If your trying to open the .1, .2 schematics in a current version of DxDesigner, a .proj file is required for the migration to the new database format.
A sample .proj file is included in the zip file attached to this previous answer. It is likely you will also have to update the wir files, and verify all symbols are of type module and not composite.
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