WFMLRSVCApp.ear file missing 11g Installation

Last week I was installing oracle 11gR2.

There were row zip files:

linux_11gR2_database_1of2.zip
linux_11gR2_database_2of2.zip

First time they were extracted in two different folder Disk1 and Diks2.
Then all the contents of one folder were copied to another folder.
Under this condition I started my installation.
After some time i got an error like

File not found .......... WFMLRSVCApp.ear

I stopped installation and tried as below:

Without unzipping into two different folders I copied those two installation zip files to a single folder and unzip them in the same folder as below:

unzip linux_11gR2_database_1of2.zip
unzip linux_11gR2_database_2of2.zip

At this time my installation was running perfectly.
thanks to link