cmd already handles exe, cmd, bat etc but if you run a file with another extension,
then use the associations set in the registry (for example via ftype / assoc) to
launch a program. This enables you to run test.txt and notepad to pop up, or
fred.msi for msiexec to be launched.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=18154
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=36646