What is the longest file path allowed to be moved to Recycle Bin?

Recycle Bin internals:

Windows XP

Every drive has its own drive:\RECYCLER\%USER_SID% directory. This directory contains all deleted files but files have names like DcN.ext where D is fixed part of the name, c is drive letter, N is a index and ext is extension of original file. Besides deleted files there is database file named INFO2.

INFO2 file starts with header. Header structure:

Offset Type  Value
0x0000 DWORD Signature  ; Always 5
0x0004 DWORD Unknown1
0x0008 DWORD Unknown2
0x000C DWORD RecordSize ; Always 0x00000320
0x0010 DWORD Unknown3

Records are stored successively immediately after header to the end of the INFO2 file. Record structure:

Offset Type               Value
0x0000 ANSICHAR[MAX_PATH] OriginalFileNameA ; Ansi string
0x0104 DWORD              Index             ; Associated with *N* from *DcN.ext*
0x0108 DWORD              DriveIndex        ; A: = 0; B: = 1; C: = 2; ...
0x010C FILETIME           DeleteFileTime
0x0114 DWORD              OriginalFileNamePhysicalSize
0x0118 WIDECHAR[MAX_PATH] OriginalFileNameW ; Wide string

Windows Vista and above

Every drive has its own drive:\$Recycle.Bin\%USER_SID% directory. This directory contains all deleted files but now there is no database file. Every deleted file is associated with 2 files inside RB.

First file has name like $INNNNNN.ext where $I is fixed part of the name, NNNNNN consists of 6 random letters or numbers and ext is extension of original file.

$I file structure:

Offset Type               Value
0x0000 DWORD              Signature         ; Always 1
0x0004 DWORD              Unknown1
0x0008 DDWORD             OriginalFileSize
0x0010 FILETIME           DeleteFileTime
0x0018 WIDECHAR[MAX_PATH] OriginalFileNameW ; Wide string

Second file has name like $RNNNNNN.ext where $R is fixed part of the name, NNNNNN is the same as in $I file and ext is extension of original file. $R file is deleted file itself.

As you see in all cases Windows stores filename in array which has size of MAX_PATH chars. That why the limit of length of filename is MAX_PATH - 1 chars.

Windows 10

Windows 10 has a new version of $I file structure (don`t know what update changed it):

Offset Type                          Value
0x0000 DWORD                         Signature         ; Always 2
0x0004 DWORD                         Unknown1
0x0008 DDWORD                        OriginalFileSize
0x0010 FILETIME                      DeleteFileTime
0x0018 DWORD                         OriginalFileNameLen
0x001C WIDECHAR[OriginalFileNameLen] OriginalFileNameW ; Wide string

And it looks like now Windows can store any files with any paths in the Recycle Bin.