AutoHotkey is affected by a strange Windows 10 feature (or bug), which I just confirmed in Windows 10 21H2.
A program without a CompanyName value in VERSIONINFO does not appear in the context menu for "Open with".
The problem is described in detail here: https://superuser.com/questions/1199648/strange-open-with-list-inconsistent-with-registry/1256482#1256482
"Open with" is useful, e.g. for switching between different AHK executables (32/64 bit) and it would be nice to have working.
This is easy to fix in AutoHotkey.rc by adding code similar to:
VALUE "CompanyName", "The AutoHotkey Foundation"
Microsoft (https://docs.microsoft.com/en-us/windows/win32/menurc/versioninfo-resource) states:
CompanyName: Company that produced the file—for example, Microsoft Corporation or Standard Microsystems Corporation, Inc. This string is required.