В чем сей сакральный смысл,что мешает убрать кавычки и оставить только у "%1"?

chcp 1251
type nul > "%~1"
pause

@echo off
chcp 1251
echo . > "%~1"

[HKEY_CLASSES_ROOT\txtfile\shell\clear\command]
@="C:\\Program Files (x86)\\1.bat \"%1\""

как составить условие?

думал что-то типа сначала пропинговать, например, ВКонтакт.. и если пингуется, то инет есть... Но как само условие создать я незнаю(

как скрыть оптический диск из проводника?

это вообще возможно?

Control Which Drives Are Visible Throughout the System

If you need to, you can hide drives on a machine so they don't appear in My Computer, Explorer, or the open and save dialog boxes. You might do this (in conjunction with other access control measures like the "run only allowed applications" policy setting) to keep users from damaging their NT installations or installing unapproved software-hide the drives you don't want users to tamper with and they won't see them. (Actually, hidden drives are accessible through the File Manager and the NT command prompt. Solution? Turn those off with a policy.) This hiding occurs on a per-user basis, too, so you have fairly fine control over which volumes users can see.

Unlike every other value in this chapter, the value that controls drive hiding is actually a bit mask. HKCU\Software\Microsoft\Windows\CurrentVersion\Pol icies\Explorer\NODRIVES is a REG_DWORD, which makes it 32 bits long. Since NT can only map 26 drives (A: through Z, this mapping works out nicely. The upper six bits of the value are ignored; the remaining 26 bits map to each drive letter, with A: in the right-most position and Z: in the left-most, like this:

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Z Y X............C B A
To turn off drives A, B, C, and D, you'd end up with a mask value of "00000000000000000000001111"; to turn off all drives, just use all 1 bits in the mask. RegEdt32 makes it easy to add new DWORD values as bitmasks or to edit existing values as binary strings (see Chapter 5, Using RegEdt32, if you need more details), so adding this restriction is easy to do. There's one caveat: if your drive letters change-perhaps because you've added a new disk or removed an old one-your NODRIVES values will be off, and you may suddenly lose sight of a drive you wanted to keep visible.