The reason you get text files after dragging the .lia file into the Altium window is that you do not have a P-CAD importer installed. 

For versions 13.0 and older:

  1. Go to this link to download and install the PCAD ASCII importer.

  2. Go to this link to download and install Accel importer.

NOTE: These 2 importers are what you are going to need to be able to import the .lia file. Please Restart Altium software after installation.

For versions 14.0+:

1.Go to File > Import Wizard

2. A pop-up window will appear. Click Next and then click Get More Importers

3. You will be directed to the Extensions & Updates section. Click Configure

4. Under Importers/Exporters, check P-CAD and click Apply

Restart Altium software and that’s it! Your P-CAD importer is now ready to use.

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