【冷知識】處理句點或空白結尾的檔案及目錄

依據MSDN文件，檔名或目錄名稱不應以句點"."或空白結尾:

Do not end a file or directory name with a space or a period. Although the underlying file system may support such names, the Windows shell and user interface does not. However, it is acceptable to specify a period as the first character of a name. For example, ".temp".

只是，其中也提到這個限制是來自Windows Shell層，部分檔案系統可以接受，於是，我們可能會看到如下情況。在InvFileName目錄下有一個機車檔案"TrailingPeriod.”、兩個機車目錄"TrailingSpace "跟"DirTrailingPeriod."，DIR可以看到，卻無法檢視目錄或檔案內容，不能更名也沒辦法刪除，不管用命令列指令或是開檔案總管都束手無策，讓人充滿無力感!

D:\InvFileName>dir
 Volume in drive D has no label.
 Volume Serial Number is 0F24-3000

 Directory of D:\InvFileName

2012/12/14  下午 08:26    <DIR>          .
2012/12/14  下午 08:26    <DIR>          ..
2012/12/14  下午 08:27                 7 TrailingPeriod.
2012/12/14  下午 08:29    <DIR>          TrailingSpace
2012/12/14  下午 08:30    <DIR>          DirTrailingPeriod.
               1 File(s)              7 bytes
               4 Dir(s)   3,907,305,472 bytes free

D:\InvFileName>type TrailingPeriod.
The system cannot find the file specified.

D:\InvFileName>dir "TrailingSpace "
 Volume in drive D has no label.
 Volume Serial Number is 0F24-3000

 Directory of D:\InvFileName

File Not Found

D:\InvFileName>dir DirTrailingPeriod.
 Volume in drive D has no label.
 Volume Serial Number is 0F24-3000

 Directory of D:\InvFileName

File Not Found

爬文許久，好不容易摸索出正確關鍵字"Trailing Period"，才露出曙光...

微軟有篇KB 您無法刪除 NTFS 檔案系統磁碟區上的檔案或資料夾提到了"\\? \x:\folder_name\invalid_filename”URI表示法，經測試果然可以克服問題，但卻發現，這招對句點結尾的目錄似乎無效(如下方黃字區所示)，最後繞了個彎，使用"8.3短名稱"密技，推測出"DirTrailingPeriod."的8.3短名為"DirTra~1"，總算成功存取目錄。

D:\InvFileName>type "\\?\d:\InvFileName\TrailingPeriod."
Cool!!!
D:\InvFileName>dir "\\?\d:\InvFileName\TrailingSpace " /w
 Volume in drive \\?\d: has no label.
 Volume Serial Number is 0F24-3000

 Directory of \\?\d:\InvFileName\TrailingSpace

[.]  [..]
               0 File(s)              0 bytes
               2 Dir(s)   3,907,309,568 bytes free

D:\InvFileName>dir "\\?\d:\InvFileName\DirTrailingPeriod." /w
 Volume in drive \\?\d: has no label.
 Volume Serial Number is 0F24-3000

 Directory of \\?\d:\InvFileName\DirTrailingPeriod

File Not Found

D:\InvFileName>dir "\\?\d:\InvFileName\DirTra~1" /w
 Volume in drive \\?\d: has no label.
 Volume Serial Number is 0F24-3000

 Directory of \\?\d:\InvFileName\DirTra~1

[.]  [..]
               0 File(s)              0 bytes
               2 Dir(s)   3,907,309,568 bytes free