I updated my original post. You can try the following (note that I doubt it'll work if it's NTFS permissions preventing you from writing though):

# unset the RO bit on a file

system("attrib -r filename.csv");

#... do writing to file

# change file back to RO

system("attrib +r filename.csv");

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In reply to Re^3: save read-only Excel by stevieb
in thread save read-only Excel by ShashankSC

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