x64 installer gives poor error message on x86

[Tratcher]

Steps to reproduce

Win7 x86
https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/1.0.0-preview2.1-003153/dotnet-dev-win-x64.1.0.0-preview2.1-003153.exe

Expected behavior

An error saying that this is the incorrect OS architecture.

Actual behavior

The installer runs and fails with the message:
"0x80070001 – Incorrect function.”

Log excerpt:

[0354:0744][2016-10-20T18:24:27]e000: Error 0x80070001: Failed to execute EXE package.
[0784:0578][2016-10-20T18:24:27]e000: Error 0x80070001: Failed to configure per-machine EXE package.
[0784:0578][2016-10-20T18:24:27]i319: Applied execute package: VC_redist.x64.exe, result: 0x80070001, restart: None
[0784:0578][2016-10-20T18:24:27]e000: Error 0x80070001: Failed to execute EXE package.

[Forgind]

Old bug triage:
win7 x86 isn't very common at this point, and this issue doesn't seem to have gotten much traction. I'm not sure whether it reproduces or not, but I think it qualifies as low-priority, regardless.