In the first images, it says “Decrypted Successfully”. This means the file was decrypted successfully. It was decrypted to the location indicated by the field conveniently labelled “Decrypt to”.
You ask about the “green line” edge. I have no idea. It must be something you have installed in your computer. It has nothing to do with AxCrypt.
The second image with the invalid handle is hard to say the exact reason, but I suggest you copy the file to another location, such as “My documents” and try there – and ensure that the “Decrypt to” is the same folder and that you can write there and that the disk has sufficient space.
Please note that you are using outdated, obsolete and unsupported software. You should abandon this old version soon, so it is good that you are decrypting them.