If the discs are bitset to DVD-ROM most any player will play them. I haven't tested any that weren't bitset, but the ones that were played just fine for me.
My Philips DVP642 has played DVD+R DL booktyped to DVD-ROM DL, DVD+R DL not booktyped and DVD-R DL discs ... I undersyand that almost all DVD players will play DVD-ROM DL discs, certainly all the newer ones will ...
If your player plays DVD-R's only, then no. Only +R,+RW, and +R DL discs can be booktyped to DVD Rom. A -R disc can't be changed. A +R disc that has been booktyped to DVD Rom, on another computer, may play just fine in yours, even it it doesn't normally play +R discs. Commercial dvd movies are booktyped to DVD Roms. That's why they play in almost all players. My stepfather has a dvd player that won't play homemade dvds, no matter if they are +R or -R. But I booktyped a +R to be a DVD Rom, and it played perfectly.