If you installed Windows 10 and have not been able to read the old style Help Files found in some of your old handicapping programs, I found a solution. Had the same problem when Windows 7 came out, but Microsoft released a fix for that, but hasn't done so for Windows 10 and may not.
Below is a link to a procedure for the fix. I tried it and it worked for me. Look for the post by Alan Copp about 3/4 down the page. Read the replies for additional help.
Help File Fix