Ola Itamar,
sim é possivel, mas você deverá baixar o winrar por command line, baixe o UnRAR for Windows no link http://www.rarlab.com/rar_add.htm link
direto
download.
UnRAR.exe e -y -kb "C:\Pasta\Subpasta\Subpasta\Arquivo.rar" "C:\Pasta\Subpasta\Destino"
Essa opção, só descompacta arquivos txt
UnRAR.exe e -y -kb UnRAR.exe e -y -kb "C:\Pasta\Subpasta\Subpasta\Arquivo.rar" *\*.txt "C:\Pasta\Subpasta\Destino"
Usage: unrar <command> -<switch 1> -<switch N> <archive> <files...>
<@listfiles...> <path_to_extract\>
<Commands>
e Extract files to current directory
l[t,b] List archive [technical, bare]
p Print file to stdout
t Test archive files
v[t,b] Verbosely list archive [technical,bare]
x Extract files with full path
<Switches>
- Stop switches scanning
@[+] Disable [enable] file lists
ac Clear Archive attribute after compression or extraction
ad Append archive name to destination path
ag[format] Generate archive name using the current date
ai Ignore file attributes
ap<path> Set path inside archive
av- Disable authenticity verification check
c- Disable comments show
cfg- Disable read configuration
cl Convert names to lower case
cu Convert names to upper case
dh Open shared files
ep Exclude paths from names
ep3 Expand paths to full including the drive letter
f Freshen files
id[c,d,p,q] Disable messages
ierr Send all messages to stderr
inul Disable all messages
ioff Turn PC off after completing an operation
kb Keep broken extracted files
n<file> Include only specified file
n@ Read file names to include from stdin
n@<list> Include files listed in specified list file
o[+|-] Set the overwrite mode
oc Set NTFS Compressed attribute
or Rename files automatically
ow Save or restore file owner and group
p[password] Set password
p- Do not query password
r Recurse subdirectories
ri<P>[:<S>] Set priority (0-default,1-min..15-max) and sleep time in ms
sl<size> Process files with size less than specified
sm<size> Process files with size more than specified
ta<date> Process files modified after <date> in YYYYMMDDHHMMSS format
tb<date> Process files modified before <date> in YYYYMMDDHHMMSS format
tn<time> Process files newer than <time>
to<time> Process files older than <time>
ts<m,c,a>[N] Save or restore file time (modification, creation, access)
u Update files
v List all volumes
ver[n] File version control
vp Pause before each volume
x<file> Exclude specified file
x@ Read file names to exclude from stdin
x@<list> Exclude files listed in specified list file
y Assume Yes on all queries
att, Aparecido Deveza
