The old code checked for suffixes but didn't take into account trailing
whitespace. Furthermore, there is peculiar behaviour with trailing dots
too. This all happens because of the special path-handling code inside
CreateProcessW.
By studying Wine's code, we can see that CreateProcessInternalW calls
get_file_name [1] in our case because we haven't provided an application
name. That code gets the first whitespace-delimited string into app_name
excluding the quotes. It's then passed to create_process_params [2]
where there is the path handling code that transforms the command line
argument to an image path [3]. Inside Wine, the extension check if
performed after these transformations [4]. By doing the same thing in
PHP we match the behaviour and can properly match the extension even in
the given edge cases.
[1] 166895ae3a/dlls/kernelbase/process.c (L542-L543)
[2] 166895ae3a/dlls/kernelbase/process.c (L565)
[3] 166895ae3a/dlls/kernelbase/process.c (L150-L151)
[4] 166895ae3a/dlls/kernelbase/process.c (L647-L654)
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