| r65 | r66 | r67 | r68 | r69 |
| r70 | r71 | r72 | r73 | r74 |
| r75 | r76 | r77 | r78 | r79 |
| r80 | r81 | r82 | r83 | r84 |
| r85 | r86 | r87 | r88 | r89 |
| r90 | r91 | r92 | r93 | r94 |
| r95 | r96 | r97 | r98 | r99 |
| ra | rad | ram | rar | ras |
| rat | raw | rax | ray | rbf |
| rbh | rc | rcp | rct | rdf |
| rdl | rdp | rec | ref | reg |
| rek | rem | rep | report | res |
| resources | resx | ret | rev | rez |
| rft | rgb | rgba | rgn | rgp |
| rgs | rif | rix | rjs | rjt |
| rk | rl2 | rld | rle | rm |
| rmd | rmf | rmi | rmj | rml |
| rmm | rmp | rms | rmv | rmvb |
| rmvp | rmx | rnk | rnx | rol |
| rom | roq | rov | rp | rpc |
| rpg | rpjf | rpl | rpm | rpt |
| rqy | rrs | rs | rsb | rsc |
| rsl | rsm | rsml | rt | rtc |
| rtf | rtk | rtm | rts | rtsp |
| 文件扩展名 是操作系统用来标志文件格式的一种机制。通常来说，一个扩展名是跟在文件名后面的，由一个分隔符分隔。在一个像“readme.txt”的文件名中，readme是文件名，txt为扩展名，表示这个文件是一个纯文本文件。 |