Exiv2

1) The exiv2 utility does not work with absolute Windows paths, e.g. in:

exiv2.exe ex d:\temp\a.jpg 
    ./d:\temp\a.exv Could not open nor create the file.

2) The -l option should prepend the directory to the filename, ont the whole path:

exiv2.exe -l d:\Temp extract d:\Temp\IMG_1950.JPG
    d:\Temp/d:\Temp\IMG_1950.exv: Could not open nor create the file

Additional information:

Workaround: Change into the directory where the images are before running the command, then run

exiv2.exe ex a.jpg

or

exiv2.exe -l d:\Temp extract IMG_1950.JPG