[Turtle91]

All HTML files = it searches all of the files (wrap setting is ignored)

Current File = wrap selected means it will reach the end of the file and wrap back to the other end to continue the search. wrap not selected means it will stop searching the file when it reaches the end of the file (as determined by the direction of search Up/Down).

Count all = how many matches are there based on the selections you have. If you select all files, then it searches all the files (ignoring wrap setting). If you have current file selected then it will start at the cursor position and move to the end of the file in the direction selected (Up/Down) and taking into account whether you have wrap selected.