"Test KVM AHK > zz_firefox_3.0.11 > 3.download": AHK SendInput fails

(Follow-up to ROSTESTS-277.)

The following failure remains (as expected):
Test KVM AHK

Running Wine Test, Module: zz_firefox_3.0.11, Test: 3.download

3.download: Test failed: 'Opening 50MiB.dat' window failed to appear, so, downloading failed. Active Wnd: 

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Virtual PC 2004 SP1 (5.3.582.27) + WXP:
Test succeeds.

Virtual PC 2004 SP1 (5.3.582.27) + bootcdregtest-75167.iso:
Same issue.

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download.ahk, line 42 fails:
CTRL+L works (= UrlBar SelectAll), then test hangs there until timeout.

Workaround:

;            SendInput, {CTRLDOWN}l{CTRLUP}%szURL%{ENTER} ;Download some file

;            SendInput, {CTRLDOWN}l{CTRLUP}https://svn.reactos.org/storage/sylvain/50MiB.dat{ENTER} ; Same issue.

            SendInput, {CTRLDOWN}l{CTRLUP}

            Sleep, 500 ; 250 is not enough on my VPC2004.

            SendInput, %szURL%

            Sleep, 500 ; At least, 500 works.

            SendInput, {ENTER}

Fwiw, AHK Send*.

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Ftr, on my VPC2004 setup:
*Often (depending on which AHK code I try?), after test 1st run fails, test 2nd run will trigger a last-chance exception (Exception Code: 0xc0000005) (Page Fault). (Forced to restart the VM.)
\ *Some other times, I can run tests multiple times (though I seem to (still) get some failures even when I should not), but ROS will (random?) assert/crash during shutdown.
*With the workaround, I can't complete the test: "15 kiB/s" (1+ hour)...