You really shouldn't convert disc images from one format to another.
In most cases, you should be able to open the image natively in ePSXe. If you need to use a virtual drive for one reason or another and Alcohol 120% is not reading your images, then you can try Daemon Tools.
In most cases, you should be able to open the image natively in ePSXe. If you need to use a virtual drive for one reason or another and Alcohol 120% is not reading your images, then you can try Daemon Tools.