LyX and MSVCR100.dll on windows 10

[Andrew Parsloe]

I have a new computer and have been fighting my way through the windows 
10 thicket.

A main problem has been getting preview to work in LyX. I use preview 
for maths. As soon as the cursor left the math inset, a message would 
appear about not finding MSVCR100.dll. Clearing the message, LyX would 
in due course produce a preview. In the temporary directory I could see 
a number of extra files produced (e.g. a .pdf of the preview) and after 
clearing the message the .png would be generated. Looking at the MSVC 
redistributables that came with windows 10 on the new computer, the 2013 
and 2015 x86 and x64 versions were installed but not the 2010. I've 
downloaded and installed the 2010  x86 and x64 versions and now preview 
works as expected.

I may have missed it but this is a dependence that I don't recall others 
with windows 10 machines mentioning.

Andrew