Open by prefix: disable on Win10

[ProgerXP]

Windows 10 has a preference that can be enabled with this reg file:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\AutoComplete]
"Append Completion"="yes"

When enabled, Explorer starts autocompleting file names in various places (Win+R, open/save dialogs, Explorer windows, etc.). For open dialog, it does exactly what our current implementation does but natively.

Extend OpenDialogByPrefix setting (currently it has simple 0/1 value):

• if it's 1 then read the above key and set OpenDialogByPrefix to 0 if it's yes, else set to 2
• if it's 0 then don't enable open-by-prefix feature (dialog hook)
• if it's 2 (or other) then do enable

[cshnik]

Done.

[ProgerXP]

The solution works. Change default value back to UPO_AUTO, please:

-BOOL bUsePrefixInOpenDialog = TRUE;
+EUsePrefixInOpenDialog iUsePrefixInOpenDialog = UPO_DISABLED;
+BOOL bUsePrefixInOpenDialog = FALSE;

Update: I found that the same key also works on Windows 7. I don't have Vista to test this on so let's change the check from "is-win-10+" to "is-win-7+".

[cshnik]

Fixed.

[gtumanyan]

The key works even in XP, it works on any system with internet explorer installed.

[ProgerXP]

You're right. I was sure it only worked in Vista+.