QUESTION: Fix punctuation: Before you can open a M4P file youll need to figure out what kind of file the M4P file extension refers to
ANS: Before you can open a M4P file, you'll need to figure out what kind of file the M4P file extension refers to.
QUES: Take a square slightly smaller eg the bottom piece 15x15 cm while the top 10x10 cm

correct the punctuation.

CORRECTED: Take a square slightly smaller (eg, the bottom piece 15x15 cm, while the top - 10x10 cm).
Question: In addition when the putty is applied there is virtually no material left over because it is almost completely used
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Answer: In addition, when the putty is applied, there is virtually no material left over because it is almost completely used.
Breathe Do 10 or 15 minutes of meditation focused on your breathing

Can you repeat this sentence, but add in punctuation?
Breathe. Do 10 or 15 minutes of meditation, focused on your breathing.
input: Cooperation with the recipient countries national authorities has generally functioned well the results obtained in Lithuania have been especially impressive
fixed: Co-operation with the recipient countries' national authorities has generally functioned well the results obtained in Lithuania have been especially impressive.
Back on the 16th of February

Can you repeat this sentence, but add in punctuation?
Back on the 16.th of February.