There's a serious problem in Operation Flashpoint 1.75 and above (including versions 1.90/1.91) that may cause loss of all files on the partition where the game resides under some circumstances:

1) TCP/IP protocol is not fully supported or it's not working properly (e.g. it's disabled in Windows Network settings or there's a firewall disabling it)

2) the user creates a new server in DirectPlay mode (the problem can never happen using "Sockets" implementation of the network protocol)

We recommend to not create any network games under DirectPlay to avoid the risk of loss of all data on your hard drive partition.