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sqlite opens a database file in R/W mode, even if the file is read-only
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v3.34 <u><b>inherits</b> the read only flag set at operating system level (Windows File Explorer)</u> on an SQLite3 database <i>without</i> the <i>--readonly</i> flag being specified AND opens the database in readonly mode.

v3.33 simply refuses to open such a file.