Find and replace in a file

Hi everyone,
I am new to the world of shell script programming.

I have a file named Fnd1.txt which has the contents as below.
I need to replace the \t with the tab space. Can any one help me
to write a perl scipt for this.

USA45V1\tG\t341029
USAV1T1\tG\t450545
USAREJ1\tG\t572645
USAIX11\tG\t705650

The file sholud like this.
USA45V1 G 341029
USAV1T1 G 450545
USAREJ1 G 572645
USAIX11 G 705650

sed 's/[\\t]/\t/g'

The command is giving the output as:

USA45V1ttGtt341029
USAV1T1ttGtt450545
USAREJ1ttGtt572645
USAIX11ttGtt705650
USADKM1ttGtt1149074
USA1LI1ttGtt61051
USA4BR2ttGtt408800

Works for me:

# cat > xxx
USA45V1\tG\t341029
USAV1T1\tG\t450545
USAREJ1\tG\t572645
USAIX11\tG\t705650
#
#
# sed 's/[\\t]/\t/g' xxx
USA45V1         G               341029
USAV1T1         G               450545
USAREJ1         G               572645
USAIX11         G               705650

what shell are you working in?
echo $SHELL

I am working in sh. And the sed command is not working.
An it worked fine while used
perl -pe 's/[\\t]/\t/g' xxx
but wen i used this inside script its not working.

Try this,

perl -pe 's/\\t/        /g' filename.txt

Press a tab in the replace part

Regards,
Chella