The image files should be standard and as long as they are named .png, any Windows image viewer/editor that can handle the PNG format should be able to open them.
Text files on the other hand can provide a challenge switching between formats.
Traditionally, on a Mac, a CTRL-M (ASCII 13, sometimes shows as ^M) was the traditional end of line as it known as the CR or Carriage Return character. In the days of type writers, there were two steps to go to a new line: A Carriage Return would move the paper carrier back to the first position on the paper. Then a Line Feed would roll the paper up one line. On Unix based system (which Mac OSX is based on today), the typical end of line character is the Line feed, or ASCII-12 CTRL-L or ^L. MS-DOS, the background of Windows used a combination of CTRL-M CTRL-L (^M^L) to indicate an end-of-line. Microsoft has never updated Notepad from the days of old. For the most part Windows apps today should be smarter about dealing with line endings, but in Notepad your are likely to see files coming from Mac’s and Unix/Linux system to be strung together on one long line.
You should consider a better editor, like NotePad Plus for Windows. It will give you syntax highlighting, auto indenting and a bunch of other programmer friendly features.
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