Problem: MS-Windows: unnessarily loading libraries when unregistering OLE.
Solution: Also skip loading libraries when invoked with "-unregister". Run
Vim for README.txt with user privileges.
Problem: Some MS-Windows instructions are outdated.
Solution: Update the uninstall instructions and the NSIS README. (Ken
Takata, closes#3614) Also update remark about diff.exe.
Problem: MS-Windows: missing 32 and 64 bit files in installer.
Solution: Include both 32 and 64 bit GvimExt and related dll files. Remove
old Windows code from the installer. (Ken Takata, closes#2144)