Yes that is possible. Export the wallet open it up in notepad++ windows notepad is not very stable with long lines. Then find nw_accounts
that is the list of accounts. here is an example it should be all on one line.
{"nw_accounts":[
{"id":"darkcoin","currency":{"type":"Darkcoin","code":"drk"},"name":"Darkcoin","password":"6142c08d132292a7a4c7601d0315ad0d25377a498334cf97b606f04b5279a89d7362d245bc5da397981aa78034f5e4008fd19273616026c694c5ef9e4d4ee279","keys":["wallet_currency","wallet_name","wallet_password","wallet_pin"],"address":"XvkdqtNVwh7Xn9pqNRcRmijBzcMt2gP4E2","tx_count":0,"balance":0,"ts":0,"txs":{}},
{"id":"dogecoin","currency":{"type":"Dogecoin","code":"doge"},"name":"Dogecoin","password":"92a93a5844c32bf2dc04257800aa46d69d28f28e35f511083d949ef4890ea413545d492acf70d46b5d3e49f0a95e9d2f982db1c707c8dbdf68b89a45103ef8ae","keys":["wallet_currency","wallet_name","wallet_password","wallet_pin"],"address":"DKfKxXTsfGS6vpKZV8bGoo54Exva4R8PmL","tx_count":0,"balance":0,"ts":0,"txs":{}},
{"id":"bitcoin","currency":{"type":"Bitcoin","code":"btc"},"name":"Bitcoin","password":"588d4656ba4533df96ab11a98de07a5d5f9f8cadb7d47bfd6155475c107e83c57aca15902363eebf86ef243d1228161c7170ea2489c8bf8bc95fd2d0f317c2bf","keys":["wallet_currency","wallet_name","wallet_password","wallet_pin"],"address":"1DYJvGHPvrfx3GGeVEfqDHaGGXncWpqwrt","tx_count":0,"balance":0,"ts":0,"txs":{},"isbtc":true}
You see what you need to delete? also make sure that when you save it you save it all in one line no spaces no new lines.