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other ways you type in console playdemo <demo name> only view it but you can not use above function like slow,fast,fast-forward  ......

you can do in a better way 

you do not have to copy the demo file name

only rename it to a.dem or b.dem or any thing like this shoud be easy to type in the console

again you have to do not cut the file from where you extract you can copy also

all photos should be placed and explain

next time be careful and post all things with better explanation