Once you have the SDK installed * (either Manually, or with Visual Studio), you’ll find it in the following directories:
SDK 8 and later
There is an an additional FX version subdirectory:
%programfiles(x86)%\Microsoft SDKs\Windows\{ver}\bin\{FXVer} Tools
Where
{ver}is the SDK version (e.g.v8.1A)- and
{FXVer}is the applicable .Net Framework version, e.g.NETFX 4.0v
e.g.
C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools
C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6.1 Tools
SDK 7 and lower
%programfiles(x86)%\Microsoft SDKs\Windows\{ver}\Bin\
Where {ver} is the SDK version (e.g. v7.0A)
On a 32 bit O/S, replace %programfiles(x86)% with %programfiles%
* Wikipedia maintains a fairly recent set of download links to the various SDK versions – scroll to the bottom of the table for recent ones.