Ken asked for a simple program, similar to unix's "touch".
Here it is:
Touch v1 created 30-09-2006:
Similar to unix's "touch", sets the modified time of files to the current time.
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Forum Topic][
.ahk Version][
.exe Version]
Touch only changes the modified date of the files that are passed to it as arguments to the current time.
Usage: by command line, or by dropping one or more files on to the executable's icon.