pName (PSZ) - input
When the environment is passed to the target program, this name is copied into "po" in the environment description shown above.
If the string appears to be a fully qualified file specification (that is, it contains a ":" or a "\" in the second position), then the file name must include the extension, and the program is loaded from the indicated drive:directory.
If the string is not a fully qualified path, the current directory is searched. If the file name is not found in the current directory, each drive:directory specification in the PATH defined in the current-process environment is searched for this file. Note that any extension (.XXX) is acceptable for the executable file being loaded.