Attempting to open files with the lit extension fails.

[hackwrench]

Lit extension files result in System cannot open file error. Turning off plugins results in same error, but then it offers to open as text and then it opens.

[sdottaka]

WinMerge treats the .lit extension (https://en.wikipedia.org/wiki/Microsoft_Reader) as an archive file.

If you disable archive support as shown below, you should be able to open files with that extension.