Does your printer have any software like a photo or image manager in the utilities. My Cannon has a utility called easy photo print which shows the thumbnails of all the images I import into the print job.
> I have few lpr files and I would like to view the labels without printing them.
Do you really mean that they're LPR files or do you mean that you print the labels with the LPR command?
If you really mean LPR files, I can't help you — never heard of them. Bill already mentioned TrID and if you'd like to learn more about that, here's an EE article that discusses it in detail: How to determine the type of file from its contents
But I already looked at the 6,000+ TrIDNet XML files and none of them contains LPR.
The article also mentions four links to determine what a file is by its extension (such as the Solvusoft one referenced earlier). Two of the four say LPR is not found and the other two provide iffy results.
But if you mean that you print the labels with the LPR command, that's a different story. Then let's figure out what the file type of the labels really is (TrID/TrIDNet could be very helpful in that case) and then we can almost surely figure out a viewer for them. Regards, Joe