Keep in mind that the dir path is “seen” from the perspective of the machine where webMethods is installed so…
You can use the relative path such as “FlatFiles\flatfile.txt” (ie. relative to the root install directory) OR
You use the drive letter as seen by webMethods on the box where it resides. For example, if you mapped a network drive as d:\webMethods on your computer it may not actually be mapped to d:\ on the actual server. You may be having Windows network visibility type issues.
#Integration-Server-and-ESB#webmethods-Protocol-and-Transport#webMethods