Inno Setup unable to find and execute ie4uinit.exe on x64

I am trying to refresh the Windows icon cache using the well known and documented method of calling ie4uinit.exe -ClearIconCache for anything below Window 10 and ie4uinit.exe -Show on Windows 10 and above:

[Run]
Filename: "{sys}\ie4uinit.exe"; Parameters: "-ClearIconCache"; StatusMsg: "Rebuilding Windows icon cache..."; Flags: runhidden; Check: not IsWindows10AndAbove
Filename: "{sys}\ie4uinit.exe"; Parameters: "-Show"; StatusMsg: "Rebuilding Windows icon cache..."; Flags: runhidden; Check: IsWindows10AndAbove

Both commands work as expected when run in Explorer or at a command prompt. They also work correctly in Inno Setup when running on an x86 system. However, on an x64 system, the following error is produced:

The path to the file, using the {sys} constant, resolves correctly and the file exists and can be seen both in Explorer and in a directory listing at the command prompt:

$C:\Windows\System32 Directory Listing$

$C:\Windows\System32 Explorer$

The following variation of the above code, running through the command prompt, also fails in much the same way, although it is silent and only indicated by an exit code of 1 in the install log.

[Run]
Filename: "{cmd}"; Parameters: "/c {sys}\ie4uinit.exe -ClearIconCache"; StatusMsg: "Rebuilding Windows icon cache..."; Flags: runhidden; Check: not IsWindows10AndAbove
Filename: "{cmd}"; Parameters: "/c {sys}\ie4uinit.exe -Show"; StatusMsg: "Rebuilding Windows icon cache..."; Flags: runhidden; Check: IsWindows10AndAbove

I have already read clear icon cache in win 7 programmatically - execute ie4uinit.exe-ClearIconCache using C# or Visual Basic, which also has mention of this being a problem in Inno Setup (towards the bottom) and tried the workaround to copy the file and run it from elsewhere. However, attempting to copy the file to another location, using the FileCopy function, also failed to find it in C:\Windows\System32. I also tried running the same command in the [Code] section using the Exec function, but this also fails to find it in C:\Windows\System32.

I considered making a copy of the file and installing it to the temp directory to run it from there, but this file is a different version on each Windows version, so this is not really a viable solution, especially as, being a system file, it may also change in the future.

The accepted answer in the above question seems to be to build the executable for 'Any CPU' rather than 'x86'. However, I am not sure if this can be done in Inno Setup and also if doing so would have any unforeseen side effects on the installers behaviour?

Is there any way to resolve or work around this in Inno Setup?

Solution

A far simpler and better solution (thanks for the links Martin) is to have two duplicated [Run] entries for x64 with Check: IsWin64 and Flags: 64bit and to add Check: not IsWin64 to the original lines:

[Run]
Filename: "{sys}\ie4uinit.exe"; Parameters: "-ClearIconCache"; StatusMsg: "Refreshing Windows icon cache..."; Flags: runhidden; Check: not IsWindows10AndAbove and not IsWin64
Filename: "{sys}\ie4uinit.exe"; Parameters: "-Show"; StatusMsg: "Refreshing Windows icon cache..."; Flags: runhidden; Check: IsWindows10AndAbove and not IsWin64
Filename: "{sys}\ie4uinit.exe"; Parameters: "-ClearIconCache"; StatusMsg: "Refreshing Windows icon cache..."; Flags: runhidden 64bit; Check: not IsWindows10AndAbove and IsWin64
Filename: "{sys}\ie4uinit.exe"; Parameters: "-Show"; StatusMsg: "Refreshing Windows icon cache..."; Flags: runhidden 64bit; Check: IsWindows10AndAbove and IsWin64