how can i open a filename.pdf.rar file if i hav no RAR software?

Basically you can't open the file, if you don't have rar decompressing software on your computer.
If you want to try it out to see what the file contains, you can download winrar (a trial version) here: http://www.rarlab.com/download.htm

You can't open the zipped file without unzip it

sorry, shashi, but he's asking for rar-decompression, not zip.
Of course the principle is the same...

you cant

you know, it's possible that you know how to deal with a RAR file, but not PDF files. anyway, the file is a PDF inside a RAR file (sorry if I'm insulting anyone's intelligence).
Since .RAR is the last extension, you must first use the decompression software that David mentioned; I'll even say that winRAR is exactly what I would use also. afterwards, you can then use adobe acrobat reader to open the file and view it. In a sense, everyone's answer on this forum is correct (with one exception). everyone else (myself included) are(/is?) just repeating David's answer.

Thanks friends.....i loaded the rar software and got my answer..Likhita

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The rar password sometimes is the URL from where the file was downloaded. Or try to contact the poster or site administrator of the respective site. If still have problems, try some recovery software.

RAR Password Unlocker is a professional and secure WinRAR/RAR password recovery software. It supports brute-force attack, brute force with mask and dictionary attack which can restrict the search area and shorten the RAR password recovery time.



Official Site: http://www.passwordunlocker.com/rar-pass...