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Any idea how to remap AltGr to Alt?
(I'm not sure, is AltGr actually composed of two key presses?)

I wasn't able to find an AltGr scan code that works in:
HKLM\System\CurrentControlSet\Control\Keyboard Layout\Scancode Map

Key remapping utilities either don't list AltGr, or don't seem to handle it correctly.

This Stack Overflow thread didn't help?

The registry remap mentioned there didn't work before, but I'll try again (though I'm pretty sure I restarted the last time). And I don't want to run a background utility for that.

I'm thinking, maybe create a custom keyboard layout DLL.

The only free tool I know of right now is MS's Keyboard Layout Creator, which won't let me do what I want. I do want some Ctrl-Alt mode keycodes, but not RAlt turning into AltGr. In MSKLC they're linked together. There's a checkbox to turn RAlt to AltGr, but it's greyed out if there are any keycodes set for the Ctrl-Alt mode. I'm not sure if they must be tied together; if they are, why have the checkbox in the GUI at all?

Maybe I should try to figure out where to change the bit flag (fLocaleFlags |= KLLF_ALTGR) in an existing Microsoft layout DLL.

Odd tidbit: MSKLC creates separate layout DLLs for i386 and wow64 (in addition to amd64).

I have to ask, but is AltGr? I have never used it before and what does it do?

So says wikipedia.

https://en.wikipedia.org/wiki/AltGr_key

I've never used a keyboard with one of these keys before, but I guess that's not surprising considering its use.

Redocbew wrote:

So says wikipedia.

https://en.wikipedia.org/wiki/AltGr_key

I've never used a keyboard with one of these keys before, but I guess that's not surprising considering its use.

I've only heard of it being on UNIX Workstation keyboards. Although from reading the Wikipedia article, I seen it is also on the US international layout as well.

My Acer Aspire laptop has an AltGr key, but it's apparently already been remapped to Alt, because on this machine the two keys have always functioned identically.

I don't have AltGr written on the physical key. It's a function of the selected keyboard layout in Windows.

SuperSpy wrote:

My Acer Aspire laptop has an AltGr key, but it's apparently already been remapped to Alt, because on this machine the two keys have always functioned identically.

Did you set up Windows with an "English (US)" keyboard layout? That probably did it.

AltGr is ubiquitous on European keyboards, even the UK has it although it's generally only used for the €.

SharpKeys isn't a background utility by the way, it's purely a convenience tool for setting registry values. It's well worth a go.

UberGerbil wrote:

This Stack Overflow thread didn't help?

Tried the remap again, it actually does work. I must've tried another scancode suggestion from another StackOverflow question.

The thing that works is just an RAlt to LAlt remap, which apparently also affects its AltGr-ness. I do wonder if there are cases where one would want the L/R distinction (without it being AltGr), but for now it'll do.

EndlessWaves wrote:

SharpKeys isn't a background utility by the way, it's purely a convenience tool for setting registry values. It's well worth a go.

I was talking about AHK. SharpKeys doesn't have AltGr listed, nor does it detect Alt presses for scancode detection. But for the above RAlt->LAlt remap it's fine.