Hi, the PDK I currently use supports Calibre, but their header and runset file for DRC and LVS are all in TXT format (4 files in total), may I know are text files supported by Calibre?

Also, when I first opened nmDRC, it prompted me to load a runset file, so I choose the PDK's runset text file.

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And this error occured:

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I'm new in Calibre, may I know how to solve this problem? Thanks.