A colleague was trying to write a calculation tool on IIS logs. I recommended him to try the text file driver from Microsoft Jet. He couldn't get it going. The error is:
Cannot Update. Database or object is read-only
Error code is -2147217911 or 0x80040E09
Turns out the file has an extension of ".log". Once I changed it to ".txt" everything works. Can't find an explanation though.