R appears to assume that Windows drives have short file names (SFN, 8.3)
enabled; for example, that "C:/Program Files/..." is addressable as
"C:/Progra~1/...". Newer versions of Windows have SFN disabled on non-OS
This means that if you install R on a non-OS drive, you
- can't start R.exe from the command line.
- consequently, anything that attempts to spawn a new R process also fails.
This includes a lot of the commands from the popular devtools package. More
discussion and background: https://github.com/hadley/devtools/issues/1514
I don't have access to bugzilla to file this there.