[/Mere comuter main kafi arsay se ye problem hai k jub man koye file rename karta hon to woh nahe hote kuch un lekha ata hai"If u change a file name extention,tha file may become unuseable" age YES or NO ki option hote hai, plzzzz is ka hal baten mujhe bht sakht zarorat parte hai jub main 1 he book k notes dalta hoon to]
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