Description: Opens a file-selection dialog using the supplied initial directory and filter.
Calling convention: CIP_CallOpenDialog("InitialDir": String, "Extension": String): String
Parameters:
InitialDir: initial directory shown by the dialog.
Extension: file-filter text used for both the display label and filter mask, for example *.xls.
Returns: Selected file name String, or an empty String when cancelled or when either argument is missing or NULL.
Availability: Default desktop environment.
Example:
FileName := CIP_CallOpenDialog("C:\Imports", "*.xls");