What is .LOP file extension?
Stores the layout information for a Mastercook cookbook; created when a custom cookbook layout is saved.
If the LOP file is removed, an error message may appear when opening the file. To prevent the error, delete the associated files ending with ".mks," ".mlk," and ".rpt." Do not delete the ".mcf" and ".mrf" files, as these contain the actual cookbook data.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.