Ulead PHOTO EXPLORER VERSION 8.0 User Manual page 32

Ulead Photo Explorer User Guide
If....
previous and next file names have equal
number of counter digits...
previous file name has lesser number of counter
digits than the next file name...
previous file name has greater number of counter
digits than the next file name...
Note: Select Tools: Auto Rename afterwards if you prefer to apply a more organized numbering scheme to your files.
32
Sample result
File10, File15, File20
Or, File10, File10a, File11
File2, File21, File22
File35, File36, File4
Or, File39, File39a, File4