Asset type names are stored in the system table
tsysAssettypes. You can filter for Windows assets either by filtering on
tblAssets.Assettype = -1 or by adding
tsysAssettypes to your report and filtering on
tsysAssettypes.AssettypeName = 'Windows'. Please find an example below.
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
tblAssets.Lasttried
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Where tsysAssetTypes.AssetTypename = 'Windows' And tblAssetCustom.State = 1
Order by tblAssets.Assetname