What version View Studio & Runtime file?
The Runtime files are not the same as the development files. You cannot move a Runtime file to the Projects folder and expect it to open in View Studio.
Are you saying that you deleted a "file" from a "folder" manually, or you deleted an application proper use the Application Manager?
A development *.MED file contains only a portion of the application while in development stage. Other files are, or should be present pertaining to the application. It's only when you Archive an application is it compressed into one APA file, or when you Create Runtime is it compiled into one MER file.
What folder are you referring to?
Is it the MED file you have deleted?
Is it, or whatever, recoverable through Windows?
If the development file, or files are "missing", can you Restore the application with the MER file, using the Application Manager?
This option will depend on which version the MER Runtime file was created at, and whether or not it was set to Allow Conversion to Development.
I'm curious how you did, or think you did, delete an application?
Deletion, renaming, etc., of FTView Studio applications, should only be carried out through the Application Manager. I would not be messing around too much with files in the Projects folder, etc., but we all get curious, don't we?
Regards
George