Ok, what this application do?
The application tries to free storage space occupied by "others" section by filling a free device storage space until there is available space.
When there is no free space available, Windows Phone shows the standard dialog. At this point, the operating system can try to free some space by removing some internal files, which are contained under the "other" section (settings -> phone storage -> phone). After, you can just delete the created temporary files or delete them the next time you open the application.