MetaTrader has a long standing behaviour of deleting e.g. MQ4 files when you click at them and are present on some specific folders, like Downloads. For example, if you download a mq4 file in the Downloads folder and click on it in order to open it in MetaEditor, it will disappear form the Downloads folder. But it is not all gone :) The file will be present in the corresponding folder in the special data folder of MetaTrader
Thanks for your reply, but the various files where in there respective folders under the terminal data folders, e.g the experts where in the specific terminal /MQL4/Experts. I still programmed these files on last week Friday, and on Saturday morning when I started MT4, I found out that all my files and in fact all custom files are gone; was just as if the terminal was just installed with only the default (EAs:"MACD Sample" and "Moving Average", libraries, include) files present.
You may have to use a program to restore deleted files. You can also check the control panel>add/remove programs, where you can see the installation date for programs
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