Thanks for your answer, here is the exact way to replicate the problem:
1) delete all FXT files in /tester/history
2) Open MT4, choose any EA in the Strategy Tester and choose M5 timeframe (for example)
3) Press Start to get a backtest. Now the FXT file also have been created in /tester/history, in this case it´s called EURUSD5_2.fxt
4) Close MT4 (the FXT file is left intact when doing this)
5) I go to Tickstory Lite and choose the MT4 Data Editor and select the above created FXT file to edit the Max Lot Size to 2000 (instead of 200) and save the FXT file (everything working fine so far with that).
6) I open MT4 again via TDS -or- via your own Launcher from Tickstory (it doesn´t matter which one, as the same problem occurs with both).
7) Once in MT4, I simply press “Start” again for the backtest (remember, the FXT file is still there and was not deleted!), MT4 re-creates the FXT file and overwrites the one I´ve just edited in Tickstory 🙁 This can be seen by the file-time of the FXT and also that the lot-size limit is not 2000 like I edited it, but 200 again.
When repeating step 5 to 7 but write-protecting (read only) the FXT file I´ve just edited with Tickstory, MT4 does of course not overwrite the edited FXT, but says: “2013.11.16 21:13:45 TestGenerator: internal error because the file not opened”
