From screen shot looks like you are trying to upload file "iDRAC6_1.95_A00_FW_IMG.exe". "iDRAC6_1.95_A00_FW_IMG.exe" file is self-extractable application. You can double click and extract the content to a folder. "firmimg.d6" file on that extracted folder is the iDRAC image file and you need to upload this file on iDRAC 
I have an old R515. I want to reuse this as testmachine ans educational purposes I was able to approach iDRAC. It seems to be a dedicated port, but in the iDRAC settings the options is set on "Shared". "Dedicated" is not available. After a few reboots the DRAC was not reponding anymore. The lights on the DRAC NIC do not turn on anymore. The nic seems dead. I have no boot errors. I can alter the iDRAC settings by hitting F10 in the boot options. I there a way to "revive" the iDRAC NIC?
iDRAC 6 not responding